Billy Sure, kid entrepreneur is a spy!

Billy Sure, kid inventor and CEO of Sure Things, Inc., discovers a big secret about his mom in the sixth book of a hilarious middle grade series! Billy’s mom has always claimed she is a scientist doing research for the government, but he’s always suspected that there was more to the story. And as it turns out, he was right! His mom is a spy, and now she has enrolled him in spy school so he can create inventions for her top-secret spy unit. Bill...