In the 34th Horrible Harry book, Mary's plans for a perfect birthday party go horribly wrong--can her friends save the day? Mary is always neat and organized, while Harry is horribly messy. But even Mary’s carefully planned schedule can’t help when things go wrong at her own birthday party. The party is supposed to start with the kids from Room 3B taking an exciting train ride, but when their train is delayed not one . . . not two . . . but three times, Mary’s plan is completely ruined! She thinks the only thing that can make her feel better is cup after cup of sugary Island Punch—even after her mom tells her to stop. But what Mary doesn’t know is that Harry has his own wacky ideas for saving Mary’s big day. Can the kids still have fun even when nothing’s going the way it’s supposed to, or will this be the most horrible birthday ever? Praise for the Horrible Harry series: "Room 2B is every child's dream...This is one school story which rates an A+."—School Library Journal (Horrible Harry and the Green Slime) "Another perfect chapter book for transitional readers."—School Library Journal (Horrible Harry and the Drop of Doom) "Kline has an exceptional talent for capturing the language, humor, and group dynamics of a primary grade classroom... An attractive read for children just beginning to tackle novel length fiction."—School Library Journal (Song Lee in Room 2B)