The seventh Duke of Beldon, Randall Clayton, is determined to see someone punished for his cousin's death. He is convinced that the one responsible is in partnership with Professor Harmon on an endeavor to discover the lost treasure of Cleopatra's necklace. Unfortunately, Rand has become enamored with Professor Harmon's daughter, Caitlin. He sees pursuing a relationship with Cait the perfect opportunity to find out more about the men involved on the mission to find the lost necklace - sort of a case of killing two birds with one stone. However, Rand doesn't anticipate falling in love with Cait.
Cait is different than any of the women Rand has been involved with in the past. She cherishes her independence and has vowed to assist her father on his missions in any way possible, even if that means forgoing having a relationship or a family of her own. Cait has never been as attracted to another man like she is to Rand. She knows that he may be her one chance to taste what she may be missing by living her life traveling from country to country with her father, so she is willing to take whatever Rand is offering.
With a possible murderer to uncover and a quickly entangled relationship, Cait and Rand are thrown together time and again. However, can they possibly pursue a relationship when their lives are so different? After all, Cait is a commoner and Rand is of the nobility.
I had some difficulty becoming involved in Perfect Sin until about halfway through the book. The first half seemed to drag without much adventure or excitement. The last half seemed to try to make up for that with an almost overabundance of activity. Unfortunately, the twists and turns were easily predictable and rather unoriginal. Additionally, the ending was wrapped up too quickly and easily to be entirely believable.
The saving grace of Perfect Sin is that Kat Martin took the time to develop Rand's character beyond the typical arrogant duke into someone with complex emotions. We learn much about his childhood and the reasons why he responds to his feelings for Cait in the manner he does. An attempt was made to evolve Cait's character as well, but the effort seemed to fall flat.
Overall, Perfect Sin is not one of Kat Martin's better works. However, if you are a fan of hers you will probably find some redeeming qualities in the story.