After their first trip, ten-year-old Spencer decided he'd never go under the couch again. He and his little brother, Justin, had been lucky to get home safely, and without their nanny finding out they'd been gone.

But now Spencer has to go back.

Discovering the antique couch changed what started out as a rotten summer. On this second adventure, will their wishes come true? Will they be able to get back to the mysterious under-the-couch world, and return home safely?

Rainbow is the second book in the series about Spencer and Justin's fun, exciting, a little bit scary, and dangerous adventures under the couch.