A good whodunnit. A meta commentary on the genre while also showing appreciation for it. Sam Rockwell can do no wrong. If you aren't a fan of the "superior cop resenting help from a low ranking cop" cliché, it's very much that kind of story and doesn’t do a lot to twist it but there's a likable wit that keeps it riveting. Top it off with beautiful 1950s production design, then you got yourself a funny and dazzling murder mystery.