A Murder of Crows - Darcy Sweet Mystery, #7

A trip out of town to take in a seminar should have been an enjoyable week away for Darcy Sweet. But like so many times before in her life it's not to be... Things get a bit weird when she starts seeing her deceased ex-husband's ghost who gives her a cryptic message."Beware the Crow." What does it mean?And if that isn't unsettling enough, her travelling companion is murdered the first night they are away.
Is it just a random murder or is there more to it?And what has Jeff, and his message, got to do with it all?