Santino 'Sonny' Carlissimo, the son of Godfather Albert' Big Al' Carlissimo, is found in a tailored suit of his blood in the middle of Lombard Street. Sonny is the third mobster discovered in North Beach, executed by a single bullet to the head and missing a left pinkie finger. As Detective Shane Johnson delves into the investigation of the 'Pinkie Finger Killer' murders, his childhood trauma resurfaces, particularly his connection to Santino Carlissimo. Shane must navigate the Shadow Shrouded Streets of San Francisco and his past to solve this case.