Laptop

Germain gives Josh a laptop when he learns that Josh lost his phone and computer when Dee cut down the World Tree.

Citroen 2CV

Joan owns a Citroen 2CV that was a special gift from Germain. The car is damaged during the fight with the Disir at the Seine.

Clarent

Clarent is the twin sword to Excalibur. Flamel found Clarent hundreds of years ago and hid it in the wall of the building where he and Perenelle once lived. Flamel retrieves the sword while in Paris after he witnessed Dee using Excalibur.

Excalibur

Excalibur is the legendary sword that King Arthur took from stone and carried most of his life. Dee has found Excalibur and used it in the previous novel to cut down the World Tree.

Butterfly Tattoos

Germain has butterfly tattoos that he uses as a trigger for his fire magic.

Catacombs

Dee and Machiavelli...