His parents worked as extreme fishing guides for some of the nobles and uppity ups along the coast. Their reputation for catching the best fish and knowing the prime spots earned them a comfortable lifestyle. Finn grew up giving away most of the fish he caught to those who needed food vs having to sell fish. His parents were also quick to donate to the church or to the poor. They had nothing extragant but always enough to buy the best equipment and boats.
A sharp mind and a healthy disrespect for the rich that abused their power led Finn to plan a few heists. Not to steal gold but to take something of real value to the target. After a few minor successes, the heists began to get elaborate. A near miss almost brought the whole routine crashing down and that is when Finn decided he might be safer exploring the world...and before anyone traced anything to him.
He talked to his parents about an idea that had been on his mind. He had wanted to find some exotic places to fish. His mom was probably the unintentional source of that idea. She had a nack for finding the unique corners of the ocean. "Finn, the seas were boiling and tossing us around but the waves had a story to tell..." As many fish stories as he heard from his dad, he would hear just as many from his mom about the adventures they had navigating to the treasures of the sea.
His parents were mostly retired by this point and agreed to the plan. They stocked the Mara XXII and helped Finn sketch out a plan with a few places they had heard about. Finn promised to return with grand stories and looked forward to settling down after his trip.
While waiting for the spring, in the Far North, he stayed with an indigious tribe. The winter was rough and hunting sparse. The tribe suffered losses from the tough weather but also due to a darker force. Finn used his investigation skills, honed from planning heists, to uncover a murderer. He accompanied a hunting party to capture the murderer. The wilds of the north were desolate in the winter but hidden valleys, geothermally warmed caves, and ruins held wonderous and dangerous beasts.
One such beast surprised the hunting party. A giant eel or worm-like beast erupted from a frozen lake in the middle of the hunting party as they were trying to cross. The hunting party stabbed with their spears but several were seriously wounded early in the fight. The beast had sharp spikes and a hardened headplate, which allowed it to break through the ice, and were also horrific weapons. Finn pulled out his crossbow, Bessie, and put a bolt right into a break in it's leathery skin. If you swap fish stories with Finn, you can be sure he will tell you about the time he was fishing on a frozen lake and caught an eel large enough to feed the entire tribe.
Finn saved the tribe that winter and shared many fish with new friends along his journey. He has not made it back to his parents yet. He is still collecting fishing stories. You might run into him one day by a lake or on the dock. You'll know it's him if he tries to tell you his life story while giving you a fish for dinner, no coin needed.