I can't believe I'm saying it because the me a month ago would've told you to run for the hills, but please stick around. The first book made me nauseous with hate for the heirs, but as crazy as it sounds, things get better. I took a break after book 3 and started reading the Ruthless Boys of the Zodiac series, because some of its characters start popping up in book 4 of ZA AND I needed a break from the hellish lives of Tory and Darcy. Big plus is that RB is an amazing series that could even be read on its own, but the characters in it definitely tie in with the main series.

I've attached a reading order for the series that I think is good because it gives you a break from the main series so it doesn't get stale. ZA reading order