The Testament is a 2006 thriller novel by Eric Van Lustbader.

After his death, Braverman, or Bravo to his friends, finds out that his father was a member of the Gnostic Observant, a group 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 to find the secret.

During his journey, he is attacked by the Knights multiple times, and they are closer than he thinks.