Part one of two. The detective is contacted by an old Cambridge friend whose fiancee's uncle is missing. Mystery drama series based on Margery Allingham's stories, starring Peter Davison and Brian Glover

A fun day at the races for Harry and Fergus ends in tragedy when a racehorse throws a jockey from the saddle

A severed finger is brought to the Lyell Centre by DCI Rory Goodchild and immigration enforcement officer Pia Butler, who ask Nikki and Thomas to test for a DNA match with 17 year-old Syrian illegal immigrant Akka Khoury. The teenager was sent the digit by a people-smuggler who claims to have her mother and is demanding money for her safe return. Meanwhile, Akka's 12 year-old cousin Sosa is trying to enter the UK illegally hidden in a van on a cross-channel ferry. Emilia Fox stars

The squad reopens the investigation into an actress's disappearance when clips of her being assaulted in a 1990 movie are posted on the internet. Director Don Maddox features in the footage, but when questioned, he appears to have problems distinguishing fact from fiction. A potential witness is then found dead, and Brian and Jack are seconded to the unit handling the case, only to find Emily Driscoll (Dennis Waterman's daughter Hannah) is heading the operation. Imogen Stubbs and Sandra Dickinson also guest star