After using her keen observation skills to locate the missing class hamster, Beatrice Bly is eager for a new case, and when a sticky mystery goo shows up on her desk, she's ready. What is it? Where did it come from? Beatrice is entirely focused on finding out.

Except that Beatrice is supposed to be figuring out a science fair project with her best friend Nora.

Can scientific investigation combine with spy technique to solve both problems?

Spy-in-training Beatrice Bly returns in the second book in the Beatrice Bly's Rules for Spies series, using problem solving, deduction, and STEAM skills in an exciting, fun way. Young sleuths will be eager to get in on the action.