Click on a thumbnail to go to Google Books.
A Letter of Mary: A Novel of Suspense Featuring Mary Russell and Sherlock… (original 1996; edition 2007)
A Letter of Mary by Laurie R. King (1996)
Amazon.com Amazon.com Review (ISBN 0553577808, Mass Market Paperback)Sherlock Holmes and his scholarly companion Mary Russell are caught up in an exciting mystery when an archaeologist leaves them with a treasured find, a papyrus supposedly written by Mary Magdalene. When the archaeoligist winds up dead and someone attempts to make off with the artifact, Holmes and Russel become embroiled in a rollicking story filled with political intrigue and highbrow sleuthing. The level of writing hasn't been higher in this Laurie King series.
(retrieved from Amazon Thu, 03 Jan 2013 23:52:24 -0500)
August 1923. All is quiet in the Holmes household in Sussex as Mary Russell works on academic research while Sherlock Holmes conducts malodorous chemistry experiments. But the peace quickly disappears as out of the past comes Dorothy Ruskin, an amateur archeologist from the Holy Land, who brings the couple a lovely inlaid box with a tattered roll of stained papyrus inside. The evening following their meeting, Miss Ruskin dies in a traffic accident that Holmes and Mary soon prove was murder. But what was the motivation? Was it the little inlaid box holding the manuscript? Or the woman's involvement in the volatile politics of the Holy Land? Or could it have been the scroll itself, a deeply troubling letter that seems to have been written by Mary Magdalene and that contains a biblical bombshell...
(summary from another edition)