A Dark and Twisted Tide (Lacey Flint #4)
S.J. Bolton

DCI Dana Tulloch hates to admit it, but she’s fond of the mysterious Lacey. Even if she keeps on interfering in her investigations, and is meddling with the latest floater case. But now she's got to break some terrible news to her - news that could destroy Lacey's fragile state of mind.
And Lacey will need to keep her wits about her because there's a killer that's lurking around her boat, leaving her gifts she'd rather not receive . . .