Quick recap
At 13, Artemis builds the C Cube, a supercomputer made from LEP helmets, and tries to sell it to Chicago businessman Jon Spiro. Spiro steals the Cube, and Butler gets shot. Holly saves him with magic and freezing, but Butler ages about 15 years. The Cube ends up detecting the fairies, and the LEP gets involved. Artemis pulls a heist in Chicago with Holly, Mulch and Butler's sister, Juliet, recovers the Cube and gets Spiro arrested. In return, Root demands the humans' memories of fairies be wiped. Artemis tries to beat the wipe with contact lenses and leaves Mulch a medallion that holds all his memories.

