Sharp-eyed former nun Nora Breen is back, as the latest attraction in Gore-on-Sea turns deadly.

On a brilliant December morning, Nora finds her customary seaside walk rudely interrupted: she's been summoned, with Detective Inspector Rideout, to the home of Doreen Chimes, Gore-on-Sea's resident medium. Chimes would like to report a robbery - and to personally invite Rideout to that evening's private séance. It's an invitation he will regret accepting: the evening ends in a suspiciously spooky murder.

And in the coming days, more of the attendees will find themselves in peril. Can Nora figure out who - or what - is behind these spectral killings before it's too late?