The Praetorian Guard by Sandra Bingham, a non-fiction book for my book bingo. I am, so far, not impressed with the way she tries to hammer home her theories on the guard, while admitting that it's a Land of Punt situation -- everyone contemporary just knew, so no one wrote much down. So she's lacking true sources aside from a couple of writers and historians to build her view of them from, and subtly to not-so-subtly implying they don't deserve the villainous nadir they have had in historic accounts.