The Lemon Man is Patrick Callen, a bicycle-riding hitman with mild O. C. D. in Dublin, Ireland, whose carefully ordered life is totally upended when he becomes the accidental caretaker of a baby boy. Now he's got to balance his daily to-do list of errands and murders-for-hire with his unexpected domesticity, which impacts him and his work in ways he never expected . . . and that could get him killed.