“If you have read many adventure novels, you’ll know that spies spend about half of their time in the sewers. They run along sewer tunnels, shooting. They find secret hideaways in sewers. They take weird funeral barges through sewers, poled along by old men in hoods. In fact, if a spy’s kid wants to get a message to their mom or dad, the easiest way to do it is just to flush it down the toilet.”