Sandor is a large evening sailor from Transylvania. He is a talking bat with a notch in his left ear. Sandor lives all alone in the farthest corner of the classroom in an old roller box. Right below him sits the boy Jendrik. He is not a good student and is often teased by his classmates. Sandor befriends him. Together, they uncover a great secret. A thief has buried a glittering chest near the castle ruins! Sandor and Jendrik find the treasure and embark on a turbulent adventure!.