There are little boys who dream of big machines, and then there are little boys who build big machines. Boom-boom is one of those. Out of necessity, Boom-boom cobbles together a bicycle from odd parts he finds in the creepy yet wonderful old tool shed in his back yard. Friends then accompany him on a hectic, milk-out-your-nose funny ride on a homemade bobsled. Tension builds as Boom-boom's impressive and capable machines are put to the test helping to build houses for people who need them. With grit and creativity, Boom-boom solves one seemingly impossible mechanical problem after another and meets a host of entertaining friends in the process, finally learning that the best machines aren't mechanical at all. Full of humor, touching moments, crashes, and explosions, Boom-boom is sure to entertain young readers as well as not-so-young folks doing the reading.