This is an interesting literary project for the Whoniverse: a prequel to the career of one of the Doctor’s companions. While I’m sure fanfic has produced speculation on Sarah Jane Smith’s student days and early journalism career, and there is canonical evidence of the Doctor’s encounter with Rose Tyler as a baby, this is the only example I can think of where the pre-Tardis life of a companion has been published between hard covers – indeed, in this case by her creators.
The story is essentially a murder mystery / political thriller, where the identities of the baddies are obvious from a pretty early stage. It’s not Great Literature, but I think it is fun in its own right, as McLaughlin and Bartlett explore the roots of Erimem’s loyalty and toughness as depicted in the BF audios. I suspect that people who actually know about ancient Egyptian culture will find plenty to complain about, but I am fortunately unburdened by such expertise. I would go so far as to strongly recommend The Coming of the Queen to Erimem fans, and I think even those who haven’t previously encountered her will find it entertaining.