"I'm just scared somehow that you're not even real." "And what if I wasn't? What if I wasn't, but wanted to be?" When Timothy Crow gets the ability to turn into a girl whenever he goes swimming, his first reaction is to panic, resulting in his near death by drowning. Of course, the one who shows up to save him is his best friend Alex. Alex, who Timothy has been trying to avoid meeting in person recently. Timothy decides to use this second identity to rekindle the bond between him and his friend, but he seems to be missing something. What will happen when Alex takes an obvious liking to the mysterious girl he met at the lake, who doesn't seem to exist in the light of day? Why has his depression so suddenly vanished? Why does being a different person feel so much better? In the hottest summer in decades, as a comet with allegedly magical properties circles Earth, a seemingly normal boy sets out on a journey toward self-discovery and love.