Martin, son of Luke the Warrior, is captured by the evil Badrang. Seasons later, when Martin gets in a fight with Hisk, one of Badrang's horde, he is tied on top of Marshank in a storm. Bandrang hopes the seagulls eat Martin in the morning. But in the middle of the night, Rose the mouse and her friend Grumm the mole hear Martin crying out in the storm; the reason she and Grumm go to Marshank is to rescue her brother, Brome, who was captured by Badrang. She calls out to Martin whether he has seen him. She tells Grumm that they should help the poor mouse. So in the morning they use slings to ward off the seagulls to hope to free Martin, somehow.....