Swords of Charlemagne Series by Elizabeth Schechter

In 773 AD, Roland, a young man of King Charles’ court, was gifted with the sword Durendal. That sword was one of four swords of rare power, three of which were held by Wardens, mages charged with protecting the sacred bloodline of the Merovingian kings. The last sword was held by their mentor, the mage known to history as Turpin... moreIn 773 AD, Roland, a young man of King Charles’ court, was gifted with the sword Durendal. That sword was one of four swords of rare power, three of which were held by Wardens, mages charged with protecting the sacred bloodline of the Merovingian kings. The last sword was held by their mentor, the mage known to history as Turpin. That same year, a Saxon priest seeking retribution against Charles enlists the aid of a mage who seeks the swords for his own purpose, setting into motion events that lead to the battle at the Pass of Roncevaux, and to Roland’s death.A thousand years later, a research group doing excavations in part of Aachen Cathedral uncovers a collection of books and scrolls, a ring, and a sword. As they uncover the sword, they are attacked. Summoned to the site by the power of the magical attack, Yael Mystere and his apprentice, Warden-in-training Doctor Douglas Keith discover the sole survivor – Margaret Prentice, the daughter of the man leading the excavation. A second attempt on her life fails, sending Yael, Douglas and Margaret on a quest for the power behind the attacks ─ a power that has been waiting a thousand years to win the swords at all costs. less

The search for the swords brings Douglas and Margaret back to England, where Mystere has hidden the sword Almace -- his own sword. Four months pass with no signs of Mystere, and Douglas and Margaret start to make plans to go in search of him. Then they accidentally become the caretakers of an injured street urchin. The boy — a sweep’s apprentice — tells them that there is something invisible haunting the rooftops of London, preying on the children who make their living there... moreThe search for the swords brings Douglas and Margaret back to England, where Mystere has hidden the sword Almace -- his own sword. Four months pass with no signs of Mystere, and Douglas and Margaret start to make plans to go in search of him. Then they accidentally become the caretakers of an injured street urchin. The boy — a sweep’s apprentice — tells them that there is something invisible haunting the rooftops of London, preying on the children who make their living there.In the absence of Mystere, Margaret insists that they need to help, but Douglas refuses. Margaret defies him and goes anyway, only to discover that what lurks on the rooftops is far worse than she had imagined -- Caedda has taken the rooftops of London as his domain. Worse, he has taken Mystere prisoner, he holds the sword Almace, and he knows that Margaret is there.Trapped on the roofs, unable to reach Douglas, Margaret has to rely on her wits and her memories in order to save Mystere, herself and her unborn child. less