Top Secret: Crypto focuses on the blundering would-be evil villain Crystal P. Toyama, aka Crypto, as she attempts to seek revenge using blockchain. But he fails miserably due to her lack of knowledge about how blockchain technology works. It's hard to take over a city and own all its land using blockchain technology if you don't understand it! Each book in the series focuses on a key STEM concept. Includes educational callouts, sidebars, and backmatter material. Supplemental activity also included.