Ariel Vromen directs this gritty biopic tracing the career of New York contract killer Richard Kuklinski (Michael Shannon). After convincing his Catholic wife Deborah Pellicotti (Winona Ryder) that he works for Disney when he in fact produces porn videos, Polish-American Kuklinski soon finds himself on the payroll of local mobster Roy Demeo (Ray Liotta) as an 'enforcer'. As he warms to his new role amidst the New Jersey underworld, despatching 'contracts' with clinical precision, a striking contrast begins to build between that of the outwardly devoted family man and the ruthlessly efficient, emotionless killer.