These books should be read in order. Although the individual books have resolution for the main characters' romance, the plot premise is ongoing. Each book has different main characters, but the other supporting characters repeat in each installment. Adult language, violence, and sexual scenes.
I wasn't as fond of the Hero Theo in this book. He wasn't one of the men who slept for 50 years after the Change. However, he has managed not to age in those 50 years, whereas his Twin Lou has aged normally. I did like the Heroine. I'm not, though, quite sold on their romance. There was a lot going on in this book, and not all of it was smooth--but I still enjoyed it.
An intriguing series and plot premise. The characters are generally likeable. There is action and romance. I will be continuing the series.