Query: magic treehouse ninjas
Magic Tree House Books 5-8 Ebook Collection: Mystery of the Magic Spells (Magic Tree House (R) 2)
Magic Tree House: Books 5 and 6: Night of the Ninjas, Afternoon on the Amazon
Night of the Ninjas (Magic Tree House, No. 5)
Ninjas and Samurai: A Nonfiction Companion to Magic Tree House #5: Night of the Ninjas (Magic Tree House (R) Fact Tracker)
Magic Tree House Boxed Set, Books 5-8: Night of the Ninjas, Afternoon on the Amazon, Sunset of the Sabertooth, and Midnight on the Moon