Secret Cache - Burton Shirley

Book Four of the Thomas York Series brings Rachel and Thomas back to America from France, responding to the mystery of her Uncle Zach's murder in Napa Valley. Zach's family vineyard becomes a crime scene in the height of the harvest season, as criminals from his teenage past arrive in search of a hidden treasure cache. Dispute erupt at the vineyard, initiated by a hostile relative and complicated by a disruptive neighbour, both with motives against Zach and his estate. Thomas's one time nemesis learns of his identity and location, and creates a plot to have him captured. In the background, Daniel Boisvert, who has both haunted and befriended Thomas and Rachel throughout the series, puts his life on the line, bonded by their relationship.