The investigation leads DI Cadi John to Gladwell Prison where Endaf Elwy has spent over a decade locked away for the murder of his young niece, Anna Williams. On seeing Endaf, Cadi's suspicion that an innocentman has been wrongly accused is confirmed. DS Owen Vaughan comes to realise that Megan Ruddock has become the serial kidnapper's latest victim, and Megan comes to see that she may have an unlikely ally in Dylan's young daughter, Nia.

With Iona Harris under arrest and Nia Harris safe with child support workers, all of DI Cadi John and DS Owen Vaughan's attention is focused on Dylan Harris and bringing him to justice for all the suffering that he has caused. This goal is especially personal to Cadi, who is working to atone for her father wrongly accusing Endaf Elwy of a murder that Dylan committed. Megan Ruddock realises that whilst her ordeal with Dylan is over, the journey to full recovery and acceptance of who she is a longer one. Life will never quite be the same for those affected by Dylan's actions