Fairyland (2012)

"Publisher blurb: In an isolated village in the Scottish Borders, a young girl disappears every three years. Several days later, the girls return, emotionless, analytical and supremely intelligent. But the locals have an explanation. The children were taken into Hobs Wood, with its dancing lights and shifting pathways. They were taken to Fairyland. Fairyland is a scenario by Scott Dorward, for any Cthulhu system. It contains the rules of Cthulhu Dark, a rules-light Cthulhu game, which you can use to play Fairyland immediately. "