剧情：　　A Time to Heal -The team is called out to Northern Ireland to investigate the bodies of two men killed by paramilitaries twenty years ago. For Sam, it is a case that is soon to turn personal… 　　Death by Water - Tensions are running high in the ‘leaderless’ team as Leo and Harry clash over an investigation into an outbreak of breathing difficulties among children on the South Coast. 　　Nowhere Fast - When members of a race horse owning syndicate are killed in a helicopter crash, Leo and Harry investigate – and an unexpected new face at the mortuary lends a helping hand. 　　Body 21 - Approached by a group of survivors from a recent train crash, the team investigate the wreckage and a new mystery – the identity of the unidentified body 21.