Limelight is the best podcast for thrilling audio drama box sets. Subscribe now on BBC Sounds. Narrator: Becky Ripley

Mia Brake and her archaeometrist father Adam move to Milbury, a village framed by an ancient stone circle. But all is not right in Milbury. The stones emit a strange power. The villagers are eerily happy, greeting each other with the unnerving phrase "Happy Day!" And at the village school the...