Dave and Sarah are shocked by their passionate kiss; what did it mean? Dave takes refuge in tracking down Lucy's father but uncovers more than he bargained for, and the discovery sparks a course of action that has repercussions for everyone.
Casts:
David Tennant, Suranne Jones, Millie Innes, Chris Hegarty, Robert Dickson, Warren Brown, Neve McIntosh, Mark Heap, Laura Fraser, Isla Blair, Jenni Keenan-Green