Justice Hall is a book by Laurie R. King and was published in 2002. It is the sixth in the Mary Russell and Sherlock Holmes mystery series.
Summary[]
Just after completing another adventure, Russell and Holmes are startled to receive a visit by their two guides, the brothers Ali and Mahmoud, from their adventure in O Jerusalem. Only this time, they are here as their actual selves, English brothers Alistair and Marsh. And they need help in locating their missing nephew.