El lago misterioso (Mortina, 4)

Mortina and her family are going on vacation! Their destination is Villa Florida, on the shores of Mysterious Lake, where Aunt Harpy and Cousin Dilbert live. But the relaxation is short-lived: someone has put the mansion up for sale, thinking it is uninhabited. They have to stop it at all costs, and the legends of Mysterious Lake might just give them an idea.