Lakesedge

"When Violeta Graceling and her younger brother Arien arrive at the haunted Lakesedge estate, they expect to find a monster. Leta knows the terrifying rumors about Rowan Sylvanan, who drowned his entire family when he was a boy...As Leta falls for Rowan, she discovers he is bound to the Lord Under, the sinister death god lurking in the black waters of the lake...Now, to save Rowan--and herself--Leta must confront the darkness in her past, including unraveling the mystery of her connection to the Lord Under"--Provided by publisher.