In season two, Banks must deal with dramatic changes to his team as the impossible-to-read Helen Morton (Caroline Catz, DOC MARTIN) enlists as his new partner. This season, Banks receives a disturbing message from his brother and the inspector himself is linked to a murder. An ordinary accountant is found murdered and his double life is discovered; as Morton closes in on his killer her life is danger. When a teenage girl is found strangled, Banks is certain he's found her murderer, but can he trust his instincts?