It's a really good movie.
I say this upfront because I know that parts of the following review might indicate otherwise, and I wouldn't want that to be the only thing people take away from what I'm saying here. Yes, Three Billboards Outside Ebbing, Missouri has problems in its approach to some of the topics it attempts to deal with - but that doesn't stop it from also being a really well-made and engaging movie that I liked a lot. It's writer/director Martin McDonagh through and through, a great script bolstered by some of the best performances you're likely to see this year, and that alone means that it's a film very much worth seeing, warts and all.
Set in the fictional town Ebbing, Missouri, we follow divorcee Mildred Hayes in the wake of the rape and murder of her daughter, Angela. Frustrated by the inability of the local police to catch her daugher's assailant, she erects three billboards outside the town that specifically take police chief William Willoughby to task about the lack of arrests - a decision that the seemingly tightknit community of Ebbing don't take kindly to, being as Willoughby is in the late stages of pancreatic cancer.