A reunion at Oxford's last all-female college ends in tragedy when one of the alumnae is killed. Is it connected to an attack there ten years before?
Watch Lewis - Series 5 Online Free
When a student dies during a clinical trial for a new drug, Lewis uncovers a web of lies, jealousy and madness - to which he himself could fall victim.
When a businesswoman is bludgeoned to death, it looks like a case of blackmail gone wrong. But there is a decades-old secret at the heart of the case.