Most easily classified as an urban fantasy/detective/action, Heretical Edge revolves around Felicity 'Flick' Chambers, a teenage girl who is brought into the hidden world of the supernatural when she is accepted as a student at Crossroads Academy, a place where humans known as Heretics train to hunt and kill the creatures known as Strangers, monsters from mythology who secretly prey upon humanity. Heretics fight these Strangers using a combination of fighting prowess and a unique blend of magic and technology. Soon, Flick learns that not everything at this school, or her own past is as it appears to be. Questions continue to mount, as Flick and her new classmates struggle to survive in this dangerous new world, while discovering the truth about the connection between Heretics and Strangers.