This episode looks at Malcolm Webster, a nurse who deliberately drove cars off the road with the intention of setting them on fire and killing his passenger. Malcolm's first wife, Claire died this way and then he tried it again with his second wife, Felicity. He was on the way to using his nursing skills to kill a third woman when he was finally captured. There is an in-depth interview with Peter Morris, the brother of Webster's first wife, Claire. Peter trusted his brother-in-law and even thought he was innocent until he discovered Malcolm had drugged his sister on her wedding day.