Her Wicked Promise by Persephone Black (The Devil's Plaything, 3)

Thirty days and ten million dollars pull the narrator back into Eva Novak’s dangerous world, a place she vowed never to return to. Her sister’s safety depends on accepting Eva’s offer, and walking away is no longer an option. Eva is fierce and unpredictable, yet something in her is shifting, softening around the edges, making the narrator question everything she thought she knew. Each promise Eva makes blurs the line between threat and longing, leaving the narrator torn between fear and the pull of belonging. Loving Eva risks her family and her life, and she must decide whether saving Eva from her own darkness is worth stepping into it herself.