Sally is banned by her father from investigative work, however she disobeys him and with Doowee investigates a mysterious cockroach thief.

Andy wants to compete in a TV talent show, but the star of his act, a hamster, has been stolen. Sally is also taking part in the contest and discovers that several of the acts - including her own, are being sabotaged.

Jaya, the best student in the class, has lost her good luck charm right before a couple of important exams. She doesn't feel confident enough to sit the exams without her charm, so she asks Sally and Doowee to investigate.

Louis is upset that his dog is missing. However, his father, Fluff Daffy, a famous R'n'B singer, doesn't seem to care because he is more concerned about his big diamond, the White Bear, which has also gone missing.

Sally's cousin, Bouleh, is due to return to India after staying with Sally for several days. Sally is glad that he is going because she found him very annoying.

Sinitta is accused of stealing sweets at a modern art museum, and she wants the SBI to prove her innocence. Sally does not trust Sinitta but Dowee is charmed by the pretty girl, and insists that they investigate.

Sally and Doowee attempt to discover who is the person placing digitally manipulated images on 'Blogger Boy's' blog, which leads to a virus being spread across the world.

The saris of the school's Indian dance troupe have been stolen, so the dancers ask the SBI to investigate. But Sally and Dowee suspect different people, so they have a disagreement and conduct separate investigations.

After three windows are broken at school, the Principal's son asks Sally to investigate. However she questions his intentions when she learns the Principal has already found the culprit.

Francis claims his books have been stolen on the eve of a chemistry test. However, when Sally and Doowee investigate they soon find the books. Doowee is ready to close the case but Sally does not want to give up so easily.

Sally is in big trouble. A teacher's stolen purse has been found in her desk, and so she is suspended from school. This means she is unable to go to school to investigate who really put the purse in her desk.

George, one of the popular boys, goes to the SBI because someone is threatening to show the whole school a photo of him sleeping with a teddy bear if he doesn't do his homework and leave it for the blackmailer to pick up.

A TV star asks Sally and Doowee to investigate leaks to the media.

Cassie, a new girl at school, becomes very popular when she boasts about her beautiful cat. However, when her friends ask to see it, the cat suddenly goes missing. Cassie's friends ask Sally and Dowee to investigate.

Sally's class is about to leave for a week's skiing excursion.

Vanilla is terrified: she believes her bedroom is haunted by the spirit of a local legend. Sally the pragmatist doesn't believe in ghosts and is determined to solve the mystery.

Business has been very slow at the SBI for the past few weeks. No clients, no mysteries, nothing.

Against the background of the election of the school's most popular student, Sally and Doowee have to uncover the identity of whoever is supplying the school students with highly sophisticated cheat notes.

Liz's secret diary has been stolen from her locker and, each day, the thief sticks up some of its pages on the school walls. The diary pages are far from flattering, which upsets many of the students.

The best student in school is alarmed when his report card shows he has failed every subject except sport. Meanwhile a top athlete, who isn't very smart, has got an excellent report. Sally and Doowee investigate.

High school rock band, the Fuzzy Frogs, discover that one of their songs has been plagiarised by TV star, Dizzie Mulligan. Sally and Doowee have to prove that the song has been illegally copied and try to find out who did it.

When the headmaster gives graffiti taggers a wall to paint on, it is covered overnight in bad graffiti. Sam, who organised the official wall, believes it was vandalised by a rival tagger, and asks the SBI to investigate.

On the day of a big school swimming competition, all the students come down with a stomach illness, except Sally. Because Doowee is stuck in the school infirmary, Sally struggles to handle the investigation on her own.

Jason, the school basketball champion, keeps having a recurring nightmare about being attacked by a giant chicken. Certain that his dream is connected to an accident at school, he asks the SBI to investigate.

A work of art about to be judged in the school art competition mysteriously disappears from a locked room. How did it disappear? Where did it go? Who took it and why? Sally and Doowee investigate.

Things start to go wrong for the SBI when they are tasked with investigating Kevina's missing designer hair scrunchies.

Odd items are being stolen from around the school - a camera, door handles, a pair of glasses and a school bag - so the SBI are called into investigate.

Francis, a Fantasy game player, commissions the SBI for a special mission: to protect him when he goes to the 'Fantastik' cards contest, so rivals can't steal his best cards.

It is nearly Christmas and Mrs. Apu is worried because she hasn't seen her friend for several days. When Sally and Doowee arrive at the old man's house, they find him upset because somebody has stolen his Father Christmas suit.

Sally's school is putting on a musical production of Little Red Riding Hood. However, someone seems to be sabotaging the rehearsals.

The kind maths teacher, Miss Smith, is having trouble keeping control of her rowdy class, so she walks out. The students are overjoyed, but Miss Smith is replaced by Miss Chicago, who is as tough as Miss Smith was kind.

Some students' clothes are secretly being altered by a mystery seamstress. They were all originally either dumped, lost or in poor condition, but are "improved" by the midnight stitch-up. The SBI investigates the mystery.

Martin comes to the SBI because his pet rabbit, Shy, seems to have changed during his holiday. Martin's friend Jaya took care of Shy while he was away, but now the rabbit has a totally different personality.

The school is hosting a Halloween party in which all the sweets and candies that have been collected are to be shared among the students. But just as the party is about to begin, the lolly trolley is hijacked!

For a school science competition, Doowee invents a machine that he says can predict the future. But before he can test it out, it is stolen. Sally and Doowee's first suspect is their old detective rival, Mr. Big.

Cassie invites only selected friends to a party, which is then crashed by four masked kids who cause trouble and then leave. When Cassie asks the SBI to investigate, it becomes apparent that while Doowee had been invited to the party, Sally had not, causing a rift within the SBI. Can Sally overcome her hurt feelings?

An eccentric young musician at Sally's school asks the SBI to investigate the disappearance of his music notebook containing his latest composition. But when the SBI checks his locker, the notebook seems to have been there all along. Could it be that their client simply has his head in the clouds?

When Bob is caught sabotaging the cakes for the school's baking competition, he calls his "lawyer," a student named Angus, who threatens to reveal secrets about the witnesses if they dare to testify against Bob.

It's the day of the School Fête and dozens of people are having fun at the various activities and stalls. During the festivities, Sally receives a mysterious anonymous phone call telling her that a stink bomb will explode at the main event in 12 minutes! Can the SBI find the bomb before it ruins the Fête?

Well-behaved students at the school are starting to act strangely: one leaps around like a monkey while another barks like a dog. When a classroom is pelted with eggs, Sally and Doowee investigate the "crazy wind."

Sally and Doowee are investigating a missing skateboard when a boy called Alex, who claims to be a seer, offers them his help. The SBI does not believe in the supernatural but Alex seems to anticipate their every move.

It's election time for Student Representative at the school. One of the candidates, Stephanie, is making strong progress in the election campaign, when suddenly her poster is torn down. She asks the SBI to investigate.

Someone has spray-painted the playground benches red. Doowee and Sally find the can of red paint. Unfortunately, a teacher sees them with the can in their hands and assumes they are the culprits.

The new president of the school Stamp Club, Leo, has brought a very rare stamp to school, but when he goes to show it to the other club members, it's missing! Sally and Doowee take on the case.

A children's author comes to the school to read an excerpt from her soon-to-be published novel in a popular series. However, when she opens her briefcase, the manuscript is not there! Sally and Doowee are immediately on the case.

It is International Day at school and there are flags from all around the world on display, representing the different nationalities of the kids at the school. Then mysteriously, one by one, the flags start to disappear!

When the SBI tries to investigate a series of fruit thefts at school, Doowee's gadgets begin malfunctioning. At first he thinks the thief is deliberately interfering with his investigation, but after the culprit is caught, it is clear that he could not have sabotaged the gadgets. Doowee begins to believe he is being haunted by bad luck, so Sally sets out to prove him wrong.