Zachary Knower

A patient's desire to end her life triggers haunting memories for Hunt; Arizona and Callie have different opinions about the future; Richard tries to adjust to his new role.

At a state wedding, Lightman and his team work to prevent the assassination of a South Korean ambassador. But when someone else is shot, Lightman exposes long-held family secrets and lies to identify the assassin.

Tensions continue to mount between Jane and Maura, causing those close to them to be caught in the middle, but the two must put aside their differences to investigate the case of a college student who died in a tunnel. Meanwhile, Jane's father, Frankie Sr. (recurring guest star CHAZZ PALMINTERI – The Usual Suspects, Hurlyburly, Bullets Over Broadway), returns with news that upsets Angela. Recurring guest star COLIN EGGLESFIELD (Something Borrowed, Melrose Place) also appears.

Holmes and Watson try to work a stateside investigation from London when someone close to them is gravely wounded by an unknown perpetrator in the United States. However, Holmes' stateside legal trouble - the result of a confession to a murder he didn't commit - threatens to derail their efforts.

When a woman is found murdered in a fashion that matches the modus operandi of a series of unsolved murders 16 years ago, the detectives suspect that the killer has resurfaced.