Agatha Mystery. The Doge's Crown

Gifted with an amazing intuition and a phenomenal memory, Agatha Mystery dreams of becoming a writer. But that is in the future; for now, she is simply an excellent detective! Together with her hapless brother Larry, a student at the detective school, she travels the world to solve the most intricate mysteries. They are assisted by a devoted butler, a grumpy Siberian cat, and a host of eccentric relatives. 
In the midst of the famous carnival, someone has stolen an ancient golden crown, one of those worn by the rulers of Venice - the doges - during the heyday of the Venetian Republic. Agatha and Larry Mystery must unravel this challenging mystery while trying not to be distracted by the magnificent architecture and the colorful whirlwind of carnival costumes and masks. The detectives are faced not only with the secrets of impoverished aristocrats but also with a gondola chase through the famous canals of the city on water!