College student Ava Hart is dating the mysterious Ash online, but he refuses to show his face. When her bus crashes off a cliff, she is pulled into The Hollow— a nightmarish realm of survival games ruled by monsters. There she discovers the truth: Ash is the Hollow King, who saved her from death by dragging her into his world. Together they battle through five deadly games — a vampire countess, a ghost doll, a corpse wedding, a false-lover phantom, and a truth-forcing demon nun — while fellow player Olivia repeatedly betrays Ava to survive. The real struggle is between them: Ash’s obsessive love makes him want to lock Ava away forever, while she fights for her freedom and choice. In the final Hollow Theater, they face the System itself. By mixing their blood and sacrificing most of his kingly power, they forge a third door back to reality. Ava and Ash finally meet in person at a coffee shop, choosing each other freely — though a faint crack in the window hints the Hollow is not done with them yet.
