This is actually one of the better books that have come out that involve the descendents of the Knights Templar and despite some chunks of exposition and infodumps that actually don't really drag the story but actually explain some of what was going on.

From having read a chunk of other grail stuff the name Sinclair was a pretty obviously a Templar link. And it was interesting to see warring factions having issues. The reality of the grail is hinted at but it's not stated which story is the true story.

Arnold Landon is being sidelined when he finds a very good forgery of the head part of a turin shroud type creation. Because of it he looks into the church where it was found and clues lead him to a Templar Organisation. When the head of this organisation is found dead things start looking a bit dangerous for Landon, and one of the witnesses is claiming that the last person to see the victim is Landon. Chief Inspector Culpepper gets involved with the murder while Landon searches to find out more about the templars being led in different directions by the Templar Group and Sinclair both of which keep throwing conflicting stories at Langdon.

I did like the twist at the end too. ( )

Two searches come together. Arnold Landon (museum department) researching 1300's Templars in Scotland and northern England and a recent-day "Club". The murder of a politician involved with a secret club brings investigating policeman together on the case with Landon. A Treasure is buried with a mouse ! ( )