Four teen-agers who have desperately tried to conceal their responsibility for a hit-and-run accident are pursued by a mystery figure seeking rev

Nancy attempts to find out why a dancing puppet is "haunting" an estate.

Despite warnings from a stranger, Nancy sets out for France to search for a flight of 99 steps which may help solve the mystery of a weird dream

Teenage Brad is tormented by confused memories of a drunken ride with his best friend Alden, during which they may have hit and killed a man.

Helping in a case their father is working on, the Hardy brothers try to find an informer who has telephoned from a booth in their home town, and

A brass-bound trunk mistakenly delivered to Nancy's cabin on a New York-bound ocean liner becomes the first clue leading her to suspect that inte

As she tries to stay alive after being left on an iceberg in the Antarctic, sixteen-year-old Vicky recalls the series of events that brought her

In trying to trace a missing will, detectives Frank and Joe Hardy trap a dangerous criminal who is willing to risk all--including murder--for mon

Nancy must discover who is blackmailing a foreign exchange student who is staying with one of Nancy's neighbors.

A carrier pigeon furnishes Nancy with a clue to a mysterious retreat.