The Testament (Van Lustbader novel)

Plot summary

The book is about Braverman Shaw, whose father, Dexter Shaw, is killed by an explosion. After his death Braverman, for friends Bravo, finds out that his father was a member of the Gnostic Observant, a group of people who possess a very old secret of Jesus Christ. Bravo has to find the secret and keep it hidden from their sworn enemies, the Knights of Saint-Clemens. His father left behind a maze, which Bravo has to solve in order to find the secret. During his journey he's attacked by the Knights multiple times, and they're closer than he thinks.