Memnoch the Devil is the fifth novel of the Vampire Chronicles, and follows The Tale of the Body Thief. In this story, Lestat is approached by Satan himself and offered a job.
Memnoch takes Lestat on a whirlwind tour of Heaven, Hell, and the main epochs in the evolution of the Universe. The tour is an effort by Memnoch to convince Lestat to join him in a noble quest.