There are ninety-nine names for God in the Koran, is it possible that there is a secret one-hundredth name?

In this tale of magic and mystery, of love and danger, Balthasar's ultimate quest is to find the secret that could save the world.

Before the dawn of the apocalyptic 'Year of the Beast' in 1666, Balthasar Embriaco, a Genoese Levantine merchant, sets out on an adventure that will take him across the breadth of the civilised world, from Constantinople, through the Mediterranean, to London shortly before the Great Fire.

Balthasar's urgent quest is to track down a copy of one of the rarest and most coveted books ever printed, a volume called 'The Hundredth Name', its contents are thought to be of vital importance to the future of the world. There are ninety-nine names for God in the Koran, and merely to know this most secret hundredth name will, Balthasar believes, ensure his salvation.