S5, E6: Having been thrust into a dark place from where it looks like there is no coming back, Banks' mission to solve Annie's murder is made all the harder by the fact he has been taken off the case and sent on gardening leave - but that won't stop him. While his old team struggle, Banks operates for the first time on the other side of the law, using his years of experience, wits and wisdom to secure the all important break-through.