"The lake monster: Can Geronimo figure out this creature's secret?"--Dust jacket. "The hunt for the golden book: Geronimo's laptop is stolen just as he's finishing up writing a special book! Can he and his friends hunt it down in time for his tenth-anniversary party?"--Dust jacket.

Includes a bonus Geronimo Stilton story The lake monster and jokes.

The hunt for the golden book -- Mini mystery: the lake monster -- Geronimo's jokes.