A safe-cracking heist in Hatton Gardens nets the thieves a nice number of diamonds. The thieves are quickly caught but the diamonds remain missing. George Barclay is hired by the insurance company to find them but he comes up empty. A few months later, he buys the latest thriller from a popular author and discovers the plot is the same as the actual robbery. Back on the case, Barclay will find threatening letters, a couple of dead bodies, and a chase from England to the French Riviera.