Brian Letscher

Patrick Jane and the CBI team are called in to investigate the murder of a convict who served nine years for rape and murder, but was recently released on DNA evidence.

Lily and Marshall host a game night in honour of St Patrick's Day, while Barney is determined to go out in a green suit instead and coaxes Ted into coming with him for some un-saintly shenanigans.

When a man is found dead in an industrial cake mixer, Castle and Beckett trace the murder to an Irish gang in Staten Island and a beautiful bar owner named Siobhan O'Doul.

Olivia and the team rally when Quinn finds herself in a tragic situation; Cyrus turns to Olivia when an announcement affects Fitz's presidency.

Things get complicated as the crew battles a fire at a storage facility. Dr Jackson Avery visits from Grey Sloan and ends up collaborating with old pal Ben Warren.

While at a lunch seeking Pruitt's blessing for their relationship, Andy and Sullivan jump into action when immigration officials raid the restaurant. Travis gets roped into an awkward lunch with Chief Dixon, Emmett and Emmett's girlfriend.