Saddle up for this horse-themed early chapter book, featuring Malibu and Brooklyn--the Critter Detectives! It's summer vacation, and the pet-sitting business has slowed down a lot! Now Barbie "Malibu" Roberts and Barbie "Brooklyn" Roberts are off to help Farmer Frankie and her grumpy horse, Linguine. Can the best friends help Farmer Frankie stop Linguine from stirring up more trouble?