You're an author who writes best-selling espionage novels about a secret agent on a mission to unravel a global spy network. But when your books start to mirror the actions of a real spy organisation, fiction and reality begin to merge.

You're on a train to go see your parents. You notice a grungy-looking man with long, messy hair and a beard, walking towards you. He points at the empty seat across from you.

Is it taken?

Before you can answer, he sits right in front of you