Above Suspicion: Season One

A British TV show. IMDb writes, "Young Detective Constable Anna Travis joins the team led by D.C.I. Langton to investigate a series of gruesome murders of young women, which first began eight years previously. All the victims were prostitutes and all killed in the same way. Then a seventh body is found but this is the corpse of a student, though a vital piece of evidence links her death to the others, involving a house in Manchester where Alan Daniels, a popular young actor, grew up. Anna goes undercover to get to know him better but finds herself getting emotionally involved."

Kelly Reilly is DC Travis (Mary from Sherlock Holmes). Ciaran Hinds is DCI Langton (Road to Perdition). It is different than most crime shows. The killer/actor is really good - the end is super creepy. All in all, I say: RENT IT.