I first encountered Rosita Forbes atop a camel in the middle of the Rabiana Sand Sea in southern Libya. There was probably no finer way of making this unusual writer’s acquaintance. Here, deep in the Sahara, she was in her element, disguised as an Arab woman and with only a few camels and human companions between her and a nasty, lingering death. In fact it was worse than that. Apart from the natural dangers of the desert, she was passing through the territory of tribesmen who regarded this motley expedition of an Englishwoman and the Egyptian Olympic-fencer-cum-spy-cum-explorer Ahmed Hassanein Bey with profound suspicion, if not downright hostility.