The episode - the fifth in the eight-part second series - is scheduled to air on BBC One on Tuesday 5th February at 9pm, with Jamelia playing the part of Aimee, a singer on a party boat. The episode also guest-stars Jonny Phillips as Stephen, Amanda Mealing as Eloise, Dexter Fletcher as Grant, and Dylan Edwards as RJ. Ben Miller stars as Det Insp Richard Poole, with Sara Martin as Det Sgt Camille Bordey.
As the rest of the team arrive on the scene, they start talking to staff and tourists on the boat, including entertainment boss Stephen, cook Grant, and fellow performer Eloise. They quickly gather a fuller picture of the crime scene, piecing together photographs taken at the party.
As the murder case continues, the team struggle to find the source of the poison, but when they stumble across the "gargling bottles" that the singers use before performances, it seems they have found a lead. Meanwhile, Richard is trying his best to support an emotional Camille. However, sensitivity doesn't seem to be his strong point . . .