Not Well by Kate Bold

In this new series by #1 bestselling—and critically-acclaimed—mystery and suspense author Kate Bold, Camille Grace, a rising star in the FBI's BAU unit, is dispatched to the one place she vowed to never return: the deep South. When bodies turn up on steamboats on the Mississippi River, Camille realizes she is up against a diabolical serial killer—one who will not stop until she finds him.
Camille must come to terms with her partner, and with her own local roots, as she plunges headlong into the investigation. It will require every ounce of attention she has to enter this killer's mind and crack the code. But a new lead into her own sister's disappearance may just upend everything.
A riveting psychological crime thriller full of mystery and suspense, Not Well will make you fall in love with a brilliant new female protagonist. Packed with twists and turns, her story will keep you flipping pages late into the night.