The Rapture (1) (S05E01)

Once renowned for his sharp instincts and relentless determination, DCI Walker now finds himself tormented by his own inner struggles during his latest case. Recently, he had driven his cherished Palestinian girlfriend, Salma, and her brother, Khalid, from the Gaza Strip through a border checkpoint. Tragically, Khalid detonated a bomb, killing himself and many innocent lives. In the ensuing chaos, Walker lost sight of Salma. Now back in England, he grapples with the belief that she manipulated him for her own purposes.