Good read for anyone who likes scientific mysteries. The heroine and hero share a wonderful connection and romance that does not overshadow the story, but adds much need elements to the characters. Taking the story to the space station adds the element of science without turning into the supernatural. Gerristen builds a great conspiracy theory that leads you wanting more while hating the actions the "bad guys" take. Emma and Jack fight an incredible battle that leaves you rooting for them the entire book. Only one thing brought it down from 5 stars. The book uses many NASA abbreviations that can get annoying. The author provides a glossary in the book, but I found myself having to look in the back to remind myself what something meant.