Martin prepares Carl to confront Kate in the hopes of a confession, but the surveillance operation takes an unexpected turn, leading to devastating consequences. Manchester primary school teacher Gemma Hillman goes missing and DCs Martin Young and Stella Beckett are given the task of putting her boyfriend - the prime suspect - under surveillance.
A birthday lunch held in Gemma's honour leads to secrets being exposed, and a break for Martin comes from an unexpected source, as his illicit bond with Zoe deepens. DCs Martin Young and Stella Beckett put the prime suspect under surveillance when a primary school teacher goes missing in Manchester.