Suspicion

S7 E1: The discovery of a severed female hand found floating in the Thames is the beginning of a murder enquiry. DCI Roisin Connor (Victoria Smurfit) is called in to investigate, which brings her into direct contact with Ch Supt Mike Walker (David Hayman), now back in uniform after his murder trial and relegated to running a local Richmond police station. This is a hostile reunion for Connor and Walker: she is a driven career cop who's fought her way to the top and knows all about his dubious past.