A Promise of Ashes(The Thornheart Trials 5) by Sherilee Gray

Jasmine

Death wants his missing souls back—and he’s ordered me to find them.

If I fail, Limbo will descend into chaos, trapping his reluctant consort, my sister, with him forever…

If that wasn’t bad enough, vengeful spirits are targeting the male I’m hopelessly in love with. Ren’s already been through hell and I won’t let the self-destructive fox shifter get hurt again, even if being near him is pure torture.