It is an interesting mystery book about Thea sisters, a group of mice friends, who go on a vacation to Bahamas to help a wildlife centre where they have to assist Professor Kendal and his team in their research and help few animals that are in need of help.

Later in the story a famous pirate comes to the island for sometime, but later he gets lost at sea. While leaving the island he dropped a pirate map, which is later stumbled upon by Thea sisters. Thinking that the map could lead them to a hidden treasure, the group of mice goes on an adventure to check whether they are right about the treasure or not.

Some people at the wildlife centre also helps them in their quest to find the missing treasure. Thea sisters decided that if they really got the treasure then they will use it to save the wildlife centre, as it is about to shut down due to lack of funds. Will they be able to find the treasure? What would happen if the pirate encounters them while searching for his stolen treasure?