O Jerusalem

Author Laurie R. King sends Holmes and Russell to British controlled Palestine to work on a case for Mycroft.  During their sojurn they masquerade as an Arab man and boy traveling with two others through the countryside.  Their costumes bring them into some unusual situations as Russell proves to their two guides her ability with a knife and her willingness to kill if necessary.  The four of them uncover a plot to destroy British rule and of course triumph.  An exciting story.