The Drop follows lonely bartender Bob Saginowski through a cover scheme of funelling cash to local gangsters -- 'money drops' -- in the underworld of Boston bars. Under the heavy hand of his employer and cousin Marv, Bob finds himself at the centre of a robbery gone awry and entwined in an investigation that digs deep into the neighbourhood's past where friends, families and foes all work together to make a living -- no matter the cost.