The Fractured Sky: The Empyrean Odyssey, Book II by Thomas M. Reid
What brings a demon to the gates of heaven?
The half-fiend Kaanyr Vhok finally arrives at the destination he has sacrificed so much to achieve--he is in the heart of Celestia with his lover and consort, the succubus Aliisza. Only to find that the House of the Triad is falling apart, and he is bound by a vengeful Aliisza and a renegade angel into trying to save it--not exactly the goal he had in mind.
The second full-length novel in The Empyrean Odyssey, The Fractured Sky continues to follow War of the Spider Queen favorites Aliisza and Kaanyr Vhok as the pair of fiends struggle to escape the heart of a deeply troubled Celestia while bound to a particularly determined angel.
From the Paperback edition.