This is the second YA installment of the 'Night Sky' series, although there was actually a free prequel (Dangerous Destiny) that shows how Skylar and Calvin meet. The 'adult' book set in the same world is Born to Darkness and the institute in this book is referenced in the YA books occasionally.
I've enjoyed all the books set in this world, I recommend them and will definitely be reading more of this series. For those wondering, it is based on the sci-fi premise of 'what if?' and in this instance it's what if in the not so distant future, there are some people born different who discover they have various powers? And what if the difference is something in their blood which can be used to make a drug that makes normal people look younger? And what if taking this drug has extreme side-effects?
The story moves along nicely and I enjoy the snappy dialogue. Gareth turns out to be a little nicer that he was shown to be in previous books and a couple of new characters are introduced who will likely be popping up regularly in future books. I have to say, (*SPOILER ALERT*) that I got pretty worried about Cal and considered not reading the rest of the book but then I thought about Suzanne's other books and I figured he'd be fine and he was.