This book is based around 2 MC's Aurora (Rory) and Houston.

They were together for a long time, then something awful happened and they split up, Rory hasn't been able to get over Houston even after 5 years.

Houston and Rory haven't seen each other for 5 years but they are all of a sudden put together in a work situation, queue the usual angst and worry.
The book jumps back and forth between present and past and it is not until the very end that we find out exactly why they split up.

I enjoyed the book and will definitely be reading the next book in the series