Third in Cross’s series (The Fourth Guardian, 1994; The Lost Guardian, 1995) about the guardians of the four Stones of Power, these actually being four pieces of a single god-wrought Stone that in Roman times was split among Corbo, Popillius, Drusilla, and Germanicus. The Stones confer enormous magical powers on their bearers, who naturally plot and scheme to acquire each other’s Stones. Further complications are caused by a certain Ketoko, a sort of demon who can move through time. The present guardians—Violet, Raphael, and Thaddeus; previous keepers Elena and William are departed but, maybe, not dead--must solve the problem of a troublesome Visitation from another reality; and sometime archeologist “Texas” Jed Hinks discovers an 11th-century giant warrior who, entombed with a modern guitar, was killed by a German WWII grenade. A mediocre fantasy that owes little to logic and much to authorial whim; still, fans of the previous books will certainly want to investigate.