To coach a killer / Victoria Laurie.

Enhanced descriptions from Syndetics:

As the Hamptons drags through early spring, Cat's shot at becoming the toast of the town in time for Memorial Day is dwindling-and fast. The only client she can find has been housebound for decades and claims to be the victim of a devasting curse. Then there's the matter of Detective Shepherd's intense jealousy over Maks Grinkov, the handsome bad boy who approaches Cat with an unusual offer she can't stop thinking about. Havoc finally breaks loose when a string of murders rocks the coastal community, landing Maks on the hook as the culprit . . .

While the body count rises, Cat goes from life coaching to sleuthing for the truth about Maks's less-than-wholesome background. But after digging deeper, she questions if Detective Shepherd had an unwitting hand in a related homicide case after tangling with the wrong people. With a storm approaching shore and no one to trust, Cat and her sharp-tongued best friend, Gilley, must solve a client's curse and a series of violent deaths before a killer sends them all sailing to their doom . . .