Ray O’Ryan 
Operation Twin Trouble 

Zack has to help his sisters make up after an out-of-this world argument in this twelfth Galaxy Zack chapter book adventure.Zacks twin sisters are the best of friends. Theyre never apart, share everything, and even finish each others sentences! But when the two get into an argument while visiting another planet, an astronomical fight ensues. Suddenly, Zack finds himself stuck in the middle of a tricky twin situation. Can he save Cathy and Charlottes sisterly bond from intergalactic destruction? With easy-to-read language and illustrations on almost every page, the Galaxy Zack chapter books are perfect for beginning readers!