Ireland AD 671
The Great Fair of Bealtain is almost upon the fortress of Cashel, and a line of gaudily painted wagons brings entertainers to the occasion. But preparations take a deathly turn when one carriage is set alight, and two corpses are found poisoned within.
As Sister Fidelma and her companion Eadulf investigate, they are plunged into the menacing marshlands of Osraige — where the bloody origin of the Abbey of Cainnech wreaks vengeance.
What is the symbolism of the Golden Stone, and who are the members of the Fellowship of the Raven? Fidelma and Eadulf must face untold danger before they can untangle an evil that strikes at the very heart of the kingdom.