Young spy-in-training Beatrice Bly finds herself in a sticky mess when

her latest case pulls her attention away from planning for the science fair.

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.

年轻的实习间谍比翠丝·布莱发现自己陷入了两难境地，因为最新的案子转移了她在科学展览计划上的注意力。

比翠丝·布莱利用敏锐的观察力找到了失踪的班宠仓鼠之后，渴望来个新的案子，当一种神秘的粘稠胶状物出现在她的桌子上时，她准备好了。它是什么？它是从哪里来的？比翠丝正全力寻找答案。除此之外，比翠丝还要和她**的朋友诺拉一起弄清一个科学展览项目。 科学调查能否与间谍技术相结合来解决这两个问题？

训练有素的间谍比翠丝·布莱在【比翠丝·布莱的间谍规则】系列的第二本书中回归，以一种令人兴奋的、有趣的方式使用问题解决、推理和STEAM技能。小侦探们将渴望参与到行动中来。