'Jacob's Granddaughters' isn't what you might think: it's not a stroke story about some old guy having sex with his children's progeny. In fact, there's no sex depicted here at all (though it's mentioned, what sex there is happens offstage). What it is is an interesting story about orphans, misconstrued identity, young women trying to overcome adversity, some people trying to do good, and others trying to do bad.
The plot is pretty straightforward. The story is well-told, with enough mystery that you want to read more to see what's going to happen next.
There's some action and adventure here. Like many action/adventure stories, one has to suspend one's sense of disbelief a bit; some of the problem solutions seem a bit too neat and tidy.
Technically there are some problems, with some typos, misspellings, word confusion (reign/rein), and punctuation errors. None are huge, but they do detract from the reading a bit.
Overall I found it enjoyable. It's not my favorite here on SOL, but it's good enough that I'd recommend it.