Left Behind — Douglas Black

Faced with the prospect of spending Christmas alone with his daughter, Havana, in the house he used to share with his husband, widower Stewart Robertson heads north to a campsite in Glen Coe in the Scottish Highlands. There, he meets Gary James, an American parapsychologist with beliefs very different to Stewart's own.

The sexual attraction is instantaneous, and overwhelming, and when Gary asks Stewart to spend Christmas with him and his friends in Fort William, Stewart agrees. Knowing next to nothing about each other, the two quickly start a physical relationship.

Stewart, emotional, angry and still reeling from the recent death of his husband, doesn't know if he's ready to start dating again, but he can't deny that he wants Gary, a man who is keeping a secret that threatens to derail any chance of a happy ending before they even get started.