I didn't read this book. I actually listened to the audiobook version of it. It was a fully developed mystery suspense novel. To me, taking in the content of this book was kind of like experiencing a Julie Klassen novel...except that the genre was suspense, instead of historical romance. There were a lot of ups and downs, and twists and turns. I can now say that I now know two Christian fiction authors who can take you for a long and eventful ride through Plotland.
Oath of Honor is the first book of the Blue Justice series. The series covers the stories of a family consisting of mostly police officers. In Oath of Honor, Isabelle St. John, must solve the death of her partner, who was murdered during a stakeout. The fallen officer's brother, Ryan, who is also in law enforcement, teams up with her to solve the mystery. However, the discoveries that they make causes Isabelle to wonder if the members of her own family are innocent of wrong doing.
There are a lot of characters to keep track of in this book, especially with a family having six siblings. I also found that I had to replay certain sections over and over just to catch everything that was being said. However, my interest was piqued enough to look into the rest of the Blue Justice series, which includes, Called to Protect (Chloe's book), Code of Valor (Brady's book), and Vow of Justice (Linc's book).
For your information, if you wish to read other stories of the other remaining St. John siblings, Ruthie's story is found in the novella, Code of Ethics. Derek's story is found in the collection titled, Protecting Tanner Hollow. It's the fourth novella, which is called, Lethal Agenda.
Finally, although the books in the series are about the St. John siblings and their romantic interests, the stories are generally more focused on action than on romance. Basically, these are books that I might be able to convince my male relatives to read since there is not much mush present.