Caleb could really use a bit more spending money--he needs to buy the next book in his favorite series so he can see what happens! But what can he do to raise funds once his allowance runs out? Caleb puts his head together with his best friend, Jax, and a couple other kids in their neighborhood, and come up with a brilliant idea. They're going to start their own fort-building business! Good forts are always in demand, and who better to design and construct them than kids? But when Fort Builders, Inc., gets their first gig, the group has trouble agreeing on the right way to go about it. Can they learn to work together in time to build an incredible fort, or will their business be over before it even begins?