ROCK HARD is the second book in the SINNERS ON TOUR series but it is definitely not necessary to have read the first book in the series because the author does a great job of setting up the characters and their personalities. However, the stars of this book are definitely Jessica and Sed who have numerous issues to work through but it is obvious early on that there is still a major spark between them. There are several different plotlines that come together in this book, involving not only Sed and Jessica, but his band mates, their music, and the world of a traveling rock group. Fair warning, this book is smoking hot erotic. Olivia Cunning pulls no punches when it comes to her characters. This is a fast-paced book with a group of men who are larger than life and perfect characters for a romance book.