All aboard the train to Paris! It's 1911 and the young detectives of Taylor & Rose are turning their talents to espionage. On a case for the mysterious Secret Service Bureau, the daring Miss Sophie Taylor and Miss Lillian Rose must leave London for the boulevards and grand hotels of Paris. But danger lurks beneath the bright lights of the city and intrigue and murder lie in store. As aeroplanes soar in the skies overhead, our heroines will need to put all their spy skills to the test to face the peril that awaits them...