Synopsis

The discovery of a body within an industrial cake mixer leads Castle and Beckett to an Irish gang operating in Staten Island, and a captivating bar owner named Siobhan O’Doul. Unexpectedly, Detective Ryan harbors a tangled past with Siobhan and the borough's crime family, stemming from his time as an undercover narcotics officer. As the investigation stalls, Ryan is compelled to re-enter the world he left behind, risking further entanglement with his wife.