The Royal Secret, Taylor - C

            The fifth in this series featuring Cate Hakesby, an architect, and James Marwood, a royal investigator, in 17th century London doesn't compare to its predecessors.  The central historical fact is a 1670 treaty between England and France, combining against the Dutch Republic. The story around it focuses on a Dutchman working hard to stop the treaty and committing a few murders along the way. The background information on London and its environs is always strong, but not enough to overcome a weak story.