The Last Templar is the latest book, since the Da Vinci code, to use as its hook the Order of the Knights Templar and the secrets about the life of Christ they may or may not have discovered back during the Crusades.
As such it is highly derivative and lacks real orginality. Yes, the secret that is eventually revealed may differ from the other books riding on Dan Brown's coat tails, but the expected elements are all present and correct. There is the academic who uncovers the central plot and is placed in danger as a result. There are the duplicitous elements within the Vatican who will go to any length to keep the secret. There is the globe-trotting and the discovery of hidden artefacts and there is the obligatory quantity of dicing with death and miraculous escape. Oh, and a romantic sub-plot is thrown if for good measure.
In other words The Last Templar offers nothing new. Accepting that the question remains however, is it any good? The answer is, yes. As far as this sort of genre novel goes its not a bad effort. Its fast paced, the plot is sound, with no gaping holes, and the characters are just about rounded enough to make the reader believe in and where appropriate care about them. The suspension of disbelief is required in places, especially the opening scene where knights charge out of Central Park and into a New York museum, but isn't hard to achieve with the way the book is written. The whole thing is also short and tight, with no flab to distract or bore the reader.
Overall then The Last Templar is a perfectly servicable disposable read. It will not win any awards for originality or style, but in a market flooded with Da Vinci code-style adventures it is does have the distinction of being both readable and entertaining.