Because her mother is always on the move, sixteen-year-old Steph hasn't lived anywhere longer than six months. Her only constant is an online community called CatNet, a social media site where users upload cat pictures and the admin is CheshireCat, a sentient AI who loves cat pictures. When a threat from Steph's past catches up to her and CheshireCat's existence is discovered, it's up to Steph and her friends, both online and IRL, to save them. A near-future thriller about online privacy and out-of-control technology and the importance of making connections in an increasingly fragmented society.

Steph and her mom settle in Minneapolis where Steph befriends Nell, whose mother and girlfriend are missing, and together with the help of ChesireCat they work to find Nell's missing loved ones and end up uncovering a nefarious AI hacking into social networks and chats to instigate paranoia and violence in the real world.