OK, first, this doesn't mix genres so much as it is part of a sub-genre: the centuries-apart parallel stories. I quite enjoy this sub-genre; it's why I picked this book. Unfortunately, it wasn't that good. The parallelism between the two stories was pretty tenuous, consisting mainly of the fact of ending up in love in Morocco. It's not like Julia got caught up in modern human trafficking, or had any real love-triangle-breaking choice to make, or even turned out to be a descendant of anyone in particular.
More unfortunately, though, it was boring. Cat didn't get abducted until a good third of the way through, Julia didn't head off to Morocco until some time after that, and only the last third of the book really dealt much with what actually happened in Morocco for both women — and even at that point, a good chunk of that time was actually spent with Cat's cousin Rob and his attempt to rescue her, rather than seeing what happened to her and maybe seeing more of the development of her relationship with Qasem. Except that when you get statements like "she'd been there seven months, and generally, it was pretty pleasant," I can only assume that telling us about those seven months would have been pretty dull.
So then we have the relationships. Julia and Idriss I have no problem with. Predictable, sure, but that's OK. You can see the chemistry between them, and we're told that when she goes back to Cornwall, they spend enough time on the phone that they know each other better in a few weeks than Julia and her adulterous lover of seven years ever knew each other. So that's great.
The adulterous lover in question and his wife, Julia's former best friend, are a weird pair. Anna knows about the relationship, and has for a long time, and seems to have forgiven Julia, and that's OK. That happens. But she doesn't really seem to have forgiven Michael, and doesn't even seem to like him, so despite her being pregnant and declaring with a shrug that she still loves him, I'm just not sure I can really accept their staying together. I foresee him leaving sometime after the baby's born, as he evidently doesn't even like kids and their relationship is pretty terrible at this point anyway. I really don't think it'll last.
I suppose an unhappy marriage there could be another instance of parallelism, mirroring Rob's marriage with Matty after Cat rejects him, but it seems a bit of a stretch. And as for Rob and Matty, well, I kind of feel that Johnson really screwed them over, and for no good reason. Frankly, if one of those two had a reason to be angry and suicidal, it would probably be Matty. Yes, Rob went to heroic lengths to try and save the woman he loved, and yes, he spent some pretty brutal time as a slave as a result, only to eventually be rescued from that and still be rejected by his beloved. I'm not saying he should have left happy. But Cat didn't screw him over. She never gave him any encouragement, even when their marriage seemed a foregone conclusion, and she didn't ask him to come and save her. He's presented as quite a decent fellow, and I just would have thought that even if he were angry in the beginning, he could eventually get past it. I'm not saying he ever would have been as in love with Matty as he was with Cat, but I think he could have learned to love her and their children instead of apparently being an asshole to her until he killed himself and became a vengeful ghost (more on that in a bit). As for Matty, we're not told what she was doing during her seven months of captivity, but realistically, I think we can guess. Cat was extraordinarily lucky in what happened to her; there is no reason to think Matty would have been anywhere near as fortunate. Frankly, it's astonishing that Qasem was even able to track her down to send her home with Rob. In any case, if she could get past what happened to her (and I'm just assuming that she did, fairly or otherwise), Rob should have been able to pull his damn socks up too.
So then there's Cat and Qasem. I get why he falls for her. But I have a really hard time wrapping my head around her falling for him. True, he treats her exceptionally well, and his actions at the end, with Rob and Matty and Cat herself, are fairly noble. Furthermore, I totally get what Julia says to Rob's ghost about how Cat's situation in Morocco gave her the opportunity to pursue her craft in ways that she never could have back in Cornwall. But is Cat really so self-centred that she can just forget that this is the same man who stole sixty people from their church, subjected most of them to horrendous conditions on the ship that killed several of them, and then sold those people into horrific slavery that most likely killed most of the remaining ones? Just because she always got pretty sweet treatment from him doesn't change the rest. And what about the next season? Nothing is said about his changing his ways and not doing all of the above again every season until he's too old to captain a ship. I understand that slavery in general wasn't a deal-breaker at the time, but when it's your own people, and you've witnessed firsthand the kind of treatment that slave trading actually entails? Can you still look past it? I can't imagine ever forgiving all that — certainly not without some kind of assurance that he at least wouldn't do it anymore — and the fact that Cat obviously can makes me respect her less. I think I'm supposed to see her as a strong, empowered woman, but I don't. I see her as a weak, self-centred woman who can ignore atrocities for the sake of a pair of pretty eyes and her own comfort. And that, more than anything else, ruined this story for me.
And two final notes: (1) If you're going to make a comment about the fact that Julia and Cat both apparently write their "a"s in this more typographical style (as opposed to the "o" with a tail that most people produce when writing by hand), perhaps the font you choose to represent Cat's diaries should feature a letter "a" that corresponds with that statement. Just a thought.
And (2), a ghost, really? I had no objections to the supernatural stuff in the 1625 part of the story, but do we really have to end with a ghost so angry he drove a totally unrelated man to suicide?