A vibrant young girl with Down syndrome faces her fears and finds her voice over the course of one eventful summer. Ellie is ready to have the best summer ever, drawing and hiking with her big brother Ben, until he abandons her for a giggly girlfriend named Sara. Luckily, Ellie's best friend Ling has something that can help: the marriage list! Consulting the list at every turn, the two girls watch with growing horror as Ben moves closer to the final step: becoming a Hawaii husband! What's worse, Ellie's cunning schemes to break up the happy couple threaten to put the weeping willow tree in the backyard, her favourite place in all the world, in danger. With Ling's help, Ellie devises a plan to transform Ben from full-time boyfriend back into full-time brother and save her tree all at the same time. She isn't going to let anything stop her, not a lip-gloss wearing girlfriend, not a pesky pair of lumberjacks, and certainly not one extra chromosome.