Black Hat Hacker is a complete standalone from the Chicago Syndicate world--Soraya did a great job of making it where you won't be lost if you haven't read any of the other books in the series--but if you have happened to read the other books, it's an awesome, AWESOME addition to the series!
There's lots of action, romance, and suspense as Mary and Henry, a friends-to-lovers couple, are absolutely put through the wringer, and I have to mention that this book has two heart-wrenching scenes that are so well written that they just blew my mind! I NEVER get emotional when I read books, but this time, the angst brought the tears. And as always, Soraya can flat-out write a super hot (SUPER creative!) sex scene like no one else. SO hot that even those that don't actually have any sex in them will leave you steamy! And if you've ever read any of Soraya's books before, you know, of course, there's her trademark twist that you'll never see coming!
So even if you haven't read any of the other book in the series, don't let that deter you (but I still suggest reading the series just because it's so GREAT!) I highly recommend this because they keep getting better and better!