The sorcerer Merlin gives Tom and Lea an important mission: to save the Grand Lady of the Lagoon, who is running into terrible danger! The children find themselves in Venice in the middle of a masked crowd: it's the carnival ! They look for in vain the Grand Lady ... What did Merlin mean? And why does the water keep rising in the streets? Tom and Lea must understand Merlin's instructions. Help them ! And you will learn many things about Venice, this wonderful Italian city.The sorcerer Merlin gives Tom and Lea an important mission: to save the Grand Lady of the Lagoon, who is running into terrible danger! The children find themselves in Venice in the middle of a masked crowd: it's the carnival ! They look for in vain the Grand Lady ... What did Merlin mean? And why does the water keep rising in the streets? Tom and Lea must understand Merlin's instructions. Help them ! And you will learn many things about Venice, this wonderful Italian city.