It's time to get out your invisible ink, because this week we're returning to... wait, where did I leave that invisible ink? It must be around here somewhere... this is exactly why I try and leave it in the same spot, because otherwise I... Oh never mind. We're doing spy things! Find out why the Espionage room at Cipher Room in Sydney is a pivotal moment for Jim and Kirsty (but don't grill us too closely on it), and marvel at our abilities when it comes to counting to four. We'd be fantastic spies, promise.