Watch One Good Cop for Free: How to Stream the Movie Online at 123Movies. . When his partner is killed in the line of duty, Artie Lewis becomes the legal guardian of his three orphaned girls. But during his investigation of the case, Lewis finds his life – and that of his newfound family – on the line. That's when the guilty crime-lord comes face to face with one man's rage, one man's fury, one man's justice.