When you send people passwords and private links via email or chat, there are copies of that information stored in many places. If you use a one-time link instead, the information persists for a single viewing which means it can't be read by someone else later. This allows you to send sensitive information in a safe way knowing it's seen by one person only. Think of it like a self-destructing message, a One Time Secret.
Pigeon: Impossible is the tale of Walter, a rookie secret agent faced with a problem seldom covered in basic training: what to do when a curious pigeon gets trapped inside your multi-million dollar, government-issued nuclear briefcase.