You wake to the low thrum of engines. The stateroom is not yours — and the door is locked from the outside. In your pocket, a note in handwriting you almost recognize: "Find what I left you before we reach open water."
Everything you need is in this room. No outside knowledge required.
Manifest in hand, you step off the S.S. Meridian as her horn sounds. Whoever left it for you knew you'd find your way out. You were never a passenger — you were the courier all along.