I've never read any of his books
Well, I think he is a great writer but he didn't do a too big search before writing his ancient Egyptian books. His first book in this theme was the 'River God'. Here's the summary:
Taita (not ancient Egyptian name!) was a quite educated and good-looking slave of Lord Intef. Taita fell in love with Intef's daughter, Lostris (me!!!
) but Lostris loves Tanus, the talented soldier and everyone's favourite. Lostris has to marry with the pharaoh Mamose VIII (there wasn't a king called this!
) some years later, Hyksos invaders conquer Egypt...
In his second book, 'The Seventh Scroll' Royan and Nicholas (two egypologists, I think) are looking for Mamose's tomb and mummy.
And in the third, we can see what will happen with Lostris' granson, Nefer and his beautiful Hyksos love, Mintaka.
My personal favourite is the River God, but as I said, it has not too much connection with the Hyksos times.