There are worse things than the fires of Hell...
Ciera and her men have progressed to the innermost circles, where only the worst sinners are imprisoned and tortured. They will have to make their way through those perilous places to reach her sister. Lucifer won't give Tris up easily, though, and it might already be too late for her to be saved.
A reverse harem based on Dante's Inferno, but with a kickass heroine instead of a lovesick old poet. The third and final book of the Infernal Descent series. Listening order: Hell's Calling, Hell's Weeping, and Hell's Burning.