Ringmaster: A Dark Circus Romantasy (The Kingdom of Shadow & Bone) by Des Sweet

Blurb: Welcome to the Demon King’s Circus. Where shadows dance, monsters roam, and the gateway to Hell is always open. They call me the Prince of Shadows. Born to reclaim the realm my father stole—but to do that, I must do the unthinkable: Find my mortal bride. Make her love me. And convince her to die. Only her willing soul can bind us in blood and shadow, tipping the balance of power and casting my father from his throne. Heaven wants her soul. Read more