St Thomas's College, Cambridge, has a ghost - or so some people believe. How to deal with the sightings on F staircase is an issue which bitterly divides the fellows. And when a tv unit of ghostbusters is called in and a professor collapses with a heart attack during the proceedings, the college really is in a fix. So Nathaniel Gye is called in to make discreet investigations. As he tries to tease out the twisted strands of this strange affair he finds out that this unquiet spirit did not commit suicide ten years previously, but was the victim of a more recent murder...