They met online at age six. For a decade, they've been messaging on Tumblr with the pen names Wise Girl and Seaweed Brain. There are only two rules: don't share your location and don't share your name. Everything else is fair game—dislikes, obsessions, stupid crushes, etc. Now sixteen, Annabeth is moving to NYC, where she clashes repeatedly with a boy who feels uncannily familiar.

Annabeth's expectations for Valentine's Day were simple: lie in bed, avoid people, and eat chocolate all day. She didn't expect to be banned from her apartment, or to run into famous YouTuber Percy Jackson, and to somehow ignite the wrath of his fans—all seventy million of them. How do they turn it around? Of course, faking a relationship is the only solution….

Blood of Olympus spoilers! Set after the book ends.