Hell is collapsing in Lucifer's absence. Collapsing and bringing down whole worlds around it. Unknown to humans, Earth has become a refuge for supernatural beings. A young fae has been tasked with saving his race. An old cop given a second chance starts seeing impossible things. Lucifer is busy being, well, Lucifer. Chloe finds herself over her head. And somewhere, an evil stirs.

When Artemis relocates schools to Gotham Academy she is determined to keep her head down. But something strange is afoot. The school hosts abandoned hallways and stairs that lead to nowhere. And something more sinister lurks within its walls. When students begin to disappear, it is up to Artemis and the charismatic freshman, Dick Grayson, to solve the mystery-before it's too late.