In Rogue Courier (book three of the Thomas York Series), the drama heightens for Thomas and Rachel in their Paris identities, Joseph and Emily, that they had been forced to take in fleeing from Albany. The duo take a high-risk search assignment from the wife of a missing international courier, that lead to clues on a trail from Paris to London and Amsterdam. Quickly, the courier's loyalty is in question, as the protagonists follow the puzzle to the world's diamond capital, where a covert mission unfolds involving missing diamonds in Amsterdam and a ruthless South African mine owner. Left alone in Paris, Emily becomes the target of a death threat from a deranged client. The courier's life ultimately becomes entangled in a conflict that he created for himself, forcing him to deal with the consequences of his greed. The mysterious Daniel Boisvert returns again into the lives of Joseph and Emily, adding intrigue and questions of his motive.