The Undermining of Twyla and Frank by Megan Bannen

From the author of The Undertaking of Hart and Mercy comes a heartwarming fantasy with a best friends-to-lovers rom com twist set in the delightful demigod and donut-filled world of Tanria.

The entire town of Eternity was shocked when widowed, middle-aged Twyla Banneker partnered up with her neighbor and best friend, Frank Ellis, to join the Tanrian Marshals. Eight years later, Twyla’s rewarding career patrolling the strange land of Tanria remains a welcome change from the domestic grind of mom life, despite the misgivings of her grown children.

Fortunately (or unfortunately) a recent decrease in on-the-job peril has made Twyla and Frank's job a lot safer ... and a lot less exciting. So when they discover the body of one of their fellow marshals near an enormous footprint—and Frank finds himself the inadvertent foster dad to a baby dragon—they are grateful to be back in action.
 
Soon, the friends wind up ensnared in a nefarious plot that goes far deeper than any lucrative Tanrian mineshaft. But as danger closes in and Twyla and Frank's investigation becomes more complicated, so does their easy friendship. And Twyla starts to realize that her true soul mate might be the person who has lived next door all along...