Aiden Moray is raising a son and a daughter with a fierce and powerful fairy, whose forest home is the secret doorway between the fey world and modern Earth.

When a fey monster crosses to Earth, kills one teenager, and injures two more Aiden must convince his incensed fairy wife to allow the human police and the FBI into her woods to investigate the attack.

As more people go missing, Aiden discovers that another vicious fairy wants the doorway between worlds and will not stop killing people until he wrests control from Aiden's partner.

However, the antagonistic fairies are not the only ones interested in the newly discovered doorway. While Aiden's suburban neighbors, the police, and the National Guard on the Earth side prepare for action against the forest, on the fairy side an entire fey kingdom is planning to invade Earth via the doorway.

When the two armies clash, Aiden must figure out how to save his family trapped in the middle.