The third book in the Mary Russell–Sherlock Holmes series.

It is 1923. Mary Russell Holmes and her husband, the retired Sherlock Holmes, are enjoying the summer together on their Sussex estate when they are visited by an old friend, Miss Dorothy Ruskin, an archeologist just returned from Palestine. She leaves in their protection an ancient manuscript which seems to hint at the possibility that Mary Magdalene was an apostle--an artifact certain to stir up a storm of biblical proportions in the Christian establishment. When Ruskin is suddenly killed in a tragic accident, Russell and Holmes find themselves on the trail of a fiendishly clever murderer. Brimming with political intrigue, theological arcana, and brilliant Holmesian deductions.

Amazon.com Review
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.