Smolder by Sennah Tate

Panther shifter Garret Dendras makes bad decisions. No — he’s made some f*cking horrible choices, and now he’s got no friends or family left. He’s a total pariah in his town with enough regrets to last him a lifetime, but his biggest regret of all is letting Ally go.
Allison MacDonald gave up on her first love long ago. Garret chose a life of crime over her, and it hurt, but it’s been years. She’s over it; she finally has the career she always dreamed of, and there’s no reason to keep carrying a torch for the bad boy who broke her heart.

That is, until he shows up at her Nana’s, panicking about his own grandmother’s health. His concern makes her have some second thoughts…maybe that sweet boy she remembers is still in there.

When Garret’s Grandma, Nana’s best friend, takes a turn for the worse, Garret learns about his family’s ancient secrets and Ally learns there’s more in the swamp than meets the eye. The only way to save the old woman is working together to solve the riddle she left them, but Ally swore she’d never trust him again—can she really let him lead her on a dangerous expedition through the swamp?

If she does, can she stop herself from falling for him again?