Lewis: Magnum Opus - Part One

SINOPSIS

A college dean is found bludgeoned to death in local woodland, following a heated pub debate. When an alchemic image is discovered by the body, denoting the first of four stages of a process called `The Magnum Opus', the detectives realise that there are three more murders to follow. After finding an unusual tattoo on the victim's body and two more murder victims with the same inking, Lewis and Hathaway discover that the tattoo signifies membership of a secret esoteric society that believes past sins can be forgiven by the literal sharing of guilt. Before the fourth and final murder takes place, the team must uncover the guilty secret that their victims share in order to learn the identity of the killer and the potential victim.