Sarah Bailey has recently split up with her husband Ben, and trying to remain a good mother to her children Amber and Eamon. When Amber goes inexplicably missing she reverts back to old patterns as Ben once again becomes becomes the family leader.

In an episode viewed through the eyes of DI Dunlop and Sgt Karen Mulcahy, increasingly it appears that Amber's missing mobile phone may provide a definitive answer to the mystery and that a man called Charlie may have that answer.