The Madman’s Daughter by Megan Shepherd

Sixteen-year-old Juliet Moreau has built a life for herself in London — working as a maid and trying not to think about the scandal that ruined her life. After all, no one ever proved the rumors about her father’s gruesome experiments. But when she learns he is alive and continuing his work on a remote tropical island, she is determined to find out if the accusations are true.

Accompanied by her father’s handsome young assistant, Montgomery, and an enigmatic castaway, Edward — both of whom she is deeply drawn to—Juliet travels to the island, only to discover the depths of her father’s madness.