Bellona Fashions’ Double Agent line of women’s shoes (U.S. patent pending) features trapdoors in the heels. According to the manufacturer: “The doors to the shoe(s) are spring-operated, and have additional fasteners/locks. The spring mechanism works on reverse pressure and holds the door tightly in place. The additional fastener(s) offer further security.”
Looking at this example (Code Name: The Muse), I’d say Mrs. Smith has more on her fuzzy mind than the mission. Platforms perfect for secret agents and secret drinkers.
Hat tip: Laughing Squid