Animal Treasure Island

Jim, the assistant of the keeper of the Admiral Bembo inn, and his mouse friend Gran (Rex in English) are one night asked by a rough, one-legged stranger for a room and to watch out for suspicious-looking characters. After they return to the ransacked inn later, they open the casket in hopes of gaining some money. Inside they find a map to the treasure hidden by the infamous pirate Captain Flint. Jim and Gran are captured by the pirate crew of Captain Silver and brought to Pirate Island.