Forgotten Realms: The Gossamer Plain (Empyrean Odyssey #1) by Thomas M. Reid
Ever wonder what could bring a demon to the gates of heaven?
Aliisza and Kaanyr Vhok have returned from their attempted invasion of Menzoberranzan and turned their sights on Sundabar. But before she can complete a mission in that beseiged city, Aliisza finds herself in the one place a demon would never want to go, no matter how sure she is of her wits and cunning: the very heart of Celestia!
Join everyone's favorite succubus and her half-fiend boyfriend, introduced in the War of the Spider Queen series, in the first installment of their own exciting new trilogy!