Sharpe, Luke (Children's fiction writer). Billy Sure, kid entrepreneur (Series) #8

"Text by Michael Teitelbaum."--Title page verso

"Everyone is talking about Billy Sure, the boy genius and millionaire inventor whose inventions have become instant hits. From the All Ball that turns into any sports ball to his hovercraft, Sure Things, Inc. can do no wrong! Now Billy wants to help other kids achieve their inventing dreams, so he solicits and selects new ideas to develop. Billy has been working on an invisibility invention for years, but it isn't quite right yet. Now suddenly there's a new inventor on the scene who claims to have developed it first. But it might not be all it's cracked up to be. Will Billy's dream of creating the world's first invisibility spray disappear?"--Amazon.com