Your home town is in peril. Under threat from an expanding force, only its pneumatic weaponry keeps the enemies at bay. You're the stealth expert of a crew of seagulls sent accross the seas to search for a working compressor. The journey takes you to islands of barren, boreal vegetation, riddled with mine networks. Board rusted sail ships and row back to safety.
Chat with your crew between missions, and hear their thoughts on how you've handled things. Meet enemies of your enemies in missions. Sometimes they have useful information or items to sell, but don't assume too much regarding their loyalties.
You can browse maps you've collected in missions. However, the game leans on realism as opposed to quest markers and a multitude of map icons, so the information they provide is quite subtle.