Bold, Friendly Monsters. A Heartwarming Mountain Festival. Unforgettable Fun. On Monster Mountain is a delightful picture book that brings together 20 not-so-scary , playful , and adorably odd monsters preparing for the big Monster Festival. From stringing lanterns and crafting bubble art to baking gooey treats and hosting dance parties-each monster has a unique personality, a job to do, and a heart full of kindness. Perfect for ages 4-8 , this charming tale captures the joy of teamwork, friendship, and imagination in a way that kids will beg to read again and again.