Ooooh, so much potential! The story of Zipporah has so many gaps to fill in, and I admire the author's attempt to complete it. But...I don't think she did it justice.
First, there was the plot. It was rather shallow to me, with no really interesting twists to keep the story moving. And the ending was abrupt.
Second, there was the time lapse. I found myself vaguely aware of time passing, but when I realized time had passed, lots of time had passed! Erickson skipped over years, leaving rather large development gaps. Big no-no for me.
Third, character development. I cringe just thinking about it. I didn't feel any romance, chemistry, or even attraction between Moses and Zipporah throughout the story. That's pretty sad. Moses was hardly there most of the time, Zipporah accepted and rejected and didn't have a very strong backbone, Misha was first naggy, then braggy, then distrusting and whiny, then half-accepting (I almost believe the author was trying to portray her as bipolar!); Azaz was too forceful....
Shall I continue? or do you get the point?
Lastly, the whole circumcision/covenant thingy dragged so badly for me! Ugh! I was like, "Why was this the main plot?!"
Over all, this was a disappointing rendition of the story of Zipporah for me. I am sad that I have to give this kind of review to such a promising story, but I can't justify a higher rating, IMHO.