Should an ex-detective and an SAS veteran make the ultimate sacrifice to help an ill friend?

Phil and Ken are badly shaken after Tom's death. A police officer finds Tom's body washed up with his boat and suspects foul play...

Ayesha can't let her suspicions about Tom's death go, becoming convinced that she's found evidence of murder. Meanwhile, Marion's situation deteriorates.

Phil and Ken rekindle their romance and, spurred on by Phil, Ken reconnects with his family. But Ayesha is starting to suspect that her mentor might have something to do with all of these deaths…

Phil’s antennae are raised when she finds out that Marion’s doctor had no idea about her dementia. Meanwhile, Ayesha closes in on Phil.

Phil and Ken are left reeling by the truth about Marion. Phil must do everything she can to save Ken from ruining the rest of his life and make amends for a love she let pass her by fifty years ago.