Seventh Circle is the fourth book in the Vampire Realm Series. Lincoln was entered into a pact with the devil by the Lord of the Vehemens. Only one can help him, Lilith, a vampire hunter. Lilith is an Elite Hunter with special abilities, and a strong hatred for vampires. She was angered by having to take Lincoln on as a client. She was confused when she started to have feelings for him. Now they work together to fulfill a destiny that will greatly affect them both.