Detective Catherine Snowden is supposed to be on medical leave. Instead, she's lying in a hospital bed when a dying man's spirit reaches out to her with a desperate message: I was murdered.

Oliver Ashford-Kent's car went into the Thames, his brakes sabotaged by the uncle who's been embezzling millions from the family pharmaceutical company. Now Oliver's trapped in a coma, caught between life and death, and Catherine is the only one who can hear him.

But proving murder means finding evidence the killer thought was safely buried. As Catherine digs deeper, she discovers Oliver may not be Marcus Ashford-Kent's only victim. Bodies have been disappearing into the Thames for years—young professionals who knew too much, who asked the wrong questions, who threatened to expose the truth.

And when the dead start calling for justice, Catherine must risk everything to answer—even as Marcus closes in, determined to silence her before she can prove what he's done.

Some secrets are worth killing for. And in the drowning hour, the Thames claims everyone.