This is the 22nd book in the Sister Fidelma mystery series. Set in 664 AD, Sister Fidelma is returning from a trip to Rome. She finds herself on an island where she encounters an old mentor who is dying. But he had stumbled onto something that opened the door to murder, intrigue and conspiracies.
Not speaking the language, Fidelma is limited and manipulated but unknown agents. The story is very well told and compelling to the end.