When his boss decides to give him the big break--a promotion to hit man--Cosmo, a nerdy numbers cruncher, reluctantly accepts. He's promptly taken under the wing of Steve, a veteran mobster who enjoys the perks of the job: lucrative pay, skimming off the top, and minimal hours. Cosmo apprehensively begins his training under Steve's tutelage. Right away, he demonstrates an uncanny aptitude for the work. He's both a crack marksman and a cool, detached killer. However, when he falls helplessly in love, things get complicated as he tries to extricate himself from his newfound profession.