Never Go Back - Robert Goddard

For a group of ex-RAF comrades, it is to be the reunion to end all reunions: a weekend in the Scottish castle where they were guinea pigs in a psychological experiment many years before. Most of them haven’t seen each other since. But the convivial atmosphere on the journey north is quickly shattered by the apparent suicide of one of their party.

When a second death occurs, a sense of foreboding descends on the group. It appears that the past is coming back to haunt them, a past none of them has ever spoken about. Their recollections of it are all frighteningly different. So what really happened?

In pursuit of the truth, one of them uncovers an extraordinary secret and suddenly realises that they are all in mortal danger…