Secrets from the past are uncovered as Julien finally learns the truth behind Alice and Sophie's abduction. But time is running out, and nobody in Eckhausen will listen to him. Has Julien cracked the case, or is he simply deluded? With nowhere left to turn, how far will Julien go in his search to find the truth? Meanwhile, Sam and Gemma are forced to make a heartbreaking choice and are pushed further apart than ever before. As Julien is forced to take matters into his own hands, Gemma joins him in a final desperate race to uncover the truth.
Elenco: David Morrissey , Keeley Hawes , Abigail Hardingham , Tchéky Karyo , Anastasia Hille , Roger Allam , Laura Fraser , Lia Williams .