About the book: year / The Hardy brothers, Frank and Joe, live in the American town of Bayport. In their free time from school, they enjoy helping their father, the famous detective Mr. Hardy, solve criminal crimes. It often happens that Frank and Joe give a hundred points ahead to Mr. Hardy. This time, the brothers, together with their friends, in search of the scoundrels who kidnapped their father, cover up a gang of criminals who were trying to disrupt the construction of the bridge, and find out the true reasons for the mysterious "Rose" phenomenon, which keeps the entire neighborhood in fear.