This episode saw a rejuvenated Alec (David Tennant) - and with it brought him much-needed focus. Claiming to be "reborn", he lit the metaphorical fire to smoke out his prey, namely Lee Ashworth and the aforementioned Claire.
Charlotte Rampling, Marianne Jean-Baptiste, Eve Myles, James D'Arcy and Meera Syal have joined the ITV drama – here's what we know about their characters...