Lieutenant Gavin Hardcastle is the lieutenant at the police station where Elizabeth Childs and Arthur Bell work. Sarah first meets him as he attempts to rush her into the hearing for the Maggie Chen case, but she avoids it to go freak out in the bathroom. He gives Sarah back her job after she successfully does the hearing over again later on. He then oversees the Jane Doe case involving Katja Obinger and Helena for a small while. He later talks to Sarah about going into Maggie Chen's office after she calls a meeting including Art. There she resigns from the force as the stress of the case and Helena's threats are too much for her. He is surprised but has to deal with the loss of the cop.
