Dancing in Circles — Julia Hawkes-Moore

Glasmaen is just a quiet little village set in the lovely countryside of the Welsh borderlands until, one Midsummer's Eve, the artist Isaac Tallboys fiddles up a storm and unwittingly unlocks the power of its ancient stone circle.
The resulting magic brings strange visitors to the village: the beautiful, disconcerting Ainee Sealfin; Dr Keynes and his chilling plans; and sinister Jeremy Sutherland. As the Midsummer magic builds to a climax, danger, mystery, love and farce combine to have Glasmaen's inhabitants literally dancing in circles.