The Undercutting of Rosie and Adam (Hart and Mercy #3) by Megan Bannen

From the author of The Undertaking of Hart and Mercy comes a new heartwarming fantasy rom-com with an opposites-attract twist set in the delightful, donut- and dragon-filled world of Tanria. 

Immortal demigod Rosie Fox has been patrolling Tanria for decades, but lately, the job has been losing its luster. When Rosie dies (again) by electrocution (again) after poking around inside a portal choked with shadowy thorns, she feels stuck in the rut that is her unending life.
 
The portal’s uptight creator, Adam Lee, must come in person to repair the damage. But when all the portals break down at once, Rosie and Adam wind up trapped inside the Mist. And the reticent inventor in his bespoke menswear seems to know a lot more about what’s happening than he lets on.
 
Maybe two people who have found themselves stuck in this thorny, tangled life together can find a way to unstick each other … just when their time on this earth seems to be running out.