There is not time for explanations when Mr. hardy telephones Frank and Joe form the West Coast and sends them flying off to England to help his old friend Profe

Frank and Joe have no time for explanations when Mr. Hardy sends them to England to help his old friend.

The Hardy boys accompany a Canadian teenager to Los Angeles to help locate a missing rare coin, but soon become involved in an even larger case.

Frank and Joe must solve the mysteries of a "monster" who terrorizes Bayport and a girl who runs away to join a cult, which may just be linked.

Hired to locate an old Spanish cannon, the Hardy brothers uncover an even greater treasure after perilous underwater adventures.