While playing in their room one day, brothers Samson and Theodore discover a mysterious key. They decide to search for the lock this key might fit, but when they leave their room, they come upon a strange sight. Their normal hall has been replaced with a long hallway of different doors. One door resembles the door of an old ship, and this is the door the key unlocks.

The boys find themselves on a pirate ship. The captain, although he looks a bit scary, welcomes both Samson and Theodore as part of his crew. Together, they all travel to the treasure island. Once on land, they find a cave, and the cave is filled with toys! One problem, though: there's a dragon guarding the toys.

The dragon now offers the pirate crew a riddle. Will Samson and Theodore be able to figure it out? Join them on this magical adventure through a door to another world.