The Medusa Files, Case 1: Written in Stone

Every instinct U.S. Marshal Morgan Jacobs has screams she's dangerous. And all logic says she's crazy. She couldn't have turned that man to stone with her gaze. That's impossible. Except she has no other explanation for what she remembers about that night or how she got away from him four months ago. And when her friend is kidnapped, Morgan must partner with the mysterious FBI agent Alexander Gage and face the truth...

... the monsters of myth are real and she's one of them.