The first rule of Spy Club? You don’t talk about Spy Club.

The second rule is, to avoid having your messages intercepted, opt for Dead Drops, the old-school method of passing on sensitive information. As the name suggests, Dead Drops are the opposite of Live Drops (the cliché park bench briefcase exchange). Hide your message in a prearranged spot such as behind a loose brick and leave a signal nearby (hint: your signal shouldn’t be a sign that says “top secret message in wall”).