This is number 8 in the Billy Sure Series. Billy and his friend, Manny, are celebrating after selling their rights to their hovercraft invention. Suddenly there is a new inventor in town and that inventor want to bring Manny on as the company CFO. Billy and Manny are trying to save their company by creating a new invention. Billy comes up with an invisibility spray, but so does the competitor. Billy and Manny’s friendship shows throughout the story.

Black and white sketches are interspersed throughout the text. The text is a page turner for those looking for a mystery.