The four-part drama comes to a shocking conclusion.

With the residents of Coulthard Street moving on and the inquest into Melissa's death now complete, Len finds it hard to let go. When a suspect makes a shocking confession Len doubts the outcome and goes to extreme lengths to solve the case before it is too late. When he stumbles across the hidden past of one of the residents he must appeal to his former colleagues to help make an arrest.

Are the residents of Coulthard Street still in danger? More importantly - who really murdered Melissa Young?
(thetvdb.com)

En effet le dernier épisode est assez rythmé, mais j'ai trouvé les précédents très bien mener aussi. Il fallait que les personnages s'installe psychologiquement, il y a eu certes quelques longueurs, mais je pense qu'elles étaient appropriées.