Knat Scatt Private Eye is a two-act, 1930s-style film noir musical, which played for an extended run at The Theater Building in Chicago in 1986,[1] featuring a young Steve Carell.[2] It was based on a one-act musical with the same title which was originally produced earlier that year by Players Workshop for The Children's Theater of The Second City, and performed on The Second City stage in Chicago. Both versions of Knat Scatt Private Eye were written and directed by Eric Forsberg with music and lyrics by Charlie Silliman.