It’s called dark matter, a living substance secreted by a meteorite that can make people invisible. Sixteen-year-old Leona Hewitt has been wearing it for twelve hours. It should be every teen’s fantasy—unbeatable pranks, a front row seat in her crush’s bedroom, a place to lick her wounds all alone. And it is . . . it is. Until she can’t get it off. In an instant, the fantasy becomes a nightmare. She’s stuck like this, invisible. Scratching at it, burning it off, cutting her skin off with a knife—nothing works. Dark matter is eating her, consuming her body like a bacteriophage and leaving behind a ghost. But when she wakes up in her bedroom, seemingly back to normal—only to find the city outside abandoned and ghostly quiet, she realizes she’s been transported to an impossible parallel realm. Electronics barely function, food turns mealy and rotten, fire snuffs out in seconds . . . and the only signs of life are the clues to a strange riddle left behind by a dead girl.