The Queen Who Came in From the Cold

It's 1961 and the Queen is preparing for her state visit to Italy aboard Britannia. Before she departs, a dubious witness claims to have seen a brutal murder from the royal train. The victim may be a missing friend of Princess Margaret's husband, Tony Armstrong-Jones. Along with her assistant, Joan McGraw, the Queen embarks on a second investigation, leading them to Venice in a thrilling tale of spies, deception, and Cold War intrigue.