Lewis: Season 4, Episode 4

4 - 4: Falling Darkness

A friend of pathologist Laura Hobson is found dead with a stake through her heart on Halloween and Lewis and Hathaway are told by a physic medium that they are in danger. A student who shared the house with Laura at university is then found murdered and a clue at the crime scene leads Lewis and Hathaway to yet another victim. They soon start to think that maybe Laura knows more than she is saying.