This is only going to be a quick review thing because it doesn't need a lot said. It's just that good.
So plot synopsis: a group of kids are taken to a museum and guided to the mexican room where they learn about mexican culture and the book of life. The tour guide who is particularly incredible tells them about one of the stories in the book. Which is Manolo, Jauquin and Emilia, who stuck in a sort opt love triangle end up fighting bandits, dying, coming back and learning so many important messages. Plus there's a pig that makes sheep noises.
I am linking you here to Kiss My Wonderwoman's Piece on it that sums that last point up better than I ever can : HERE