Evil is loose in the kingdom - a malevolence so thoroughly corrupt that it has sickened the very land itself. Arthur, the king of the summer lands, and his Knights of the Round Table, are charged by the Good God to seek out the legendary Holy Grail, the cup of Jesus the Christ, that it might once again bring its healing light into the world. The quest will take the legendary knights on a journey across Briton...culminating in an astonishing confrontation that will leave the listener breathless in Kingdom of Summer's wake.
The legions of Rome were in full withdraw, fighting as they went, surrounded by enemies in a multi-front war that was proving too costly for the empire to sustain. Briton, the last land conquered, became the first land abandoned, and would be left to fend for itself against the ever-encroaching barbarian hoards of Picti, Saecsons, and Hybernians - all eager to fill the vacuum that Rome left behind.
Thomas Brennan travels around the world where, as an archeologist, he sifts through history in an attempt to find validation of his Catholic faith. When proof is uncovered that authenticates two infamous icons of Christianity, the Shroud of Turin and the Sudarium of Oviedo, anticipation abounds, until a third, more monumental piece of evidence is unearthed. Also involved is the silent strong arm of the Church, Custodis Veritas, as well as someone in the FBI's Witness Protection Program who is about to turn state's evidence on a vicious, notorious mafia capo.