"Eighteen-year-old Trinity Marrow, who is losing her sight, has a well-kept secret. She can see and talk to the dead and must remain in a compound that is guarded by Wardens who are shape-shifting gargoyles. They must protect her from demons who want to capture her to take on her special powers. However, a new threat arrives, and Trinity joins forces with Zayne, a Warden from another clan, in order to save her family."

In this thrilling conclusion to the Harbinger trilogy, Trinity, who is out of options, brings Lucifer back to the world to fight the Harbinger, a decision that carries disastrous consequences with it.