Eccentric Aunt Jane needs help on her ranch so the Aldens, affectionately known as the boxcar children, get help from a private detective.

Mike Wood presents many strange happenings for the Alden children to solve when they spend the summer at Mystery Ranch.

A fifth-grader with a photographic memory and her friend Eric help solve the mystery of the stolen diamonds.

When she notices some bones missing from a dinosaur skeleton exhibited in the museum, a young girl with a photographic memory tries to discover who has been taking them and why.

Investigating incidents of sabotage on location in Bayport, where producer Mort Tannenberg is finding scenes from his own scripts coming true, Frank and Joe take on the starring roles in an all-too-real thriller

The Three Investigators are hounded by supernatural forces as they attempt to recover a stolen sculpture of a legendary wolf-dog.

Nancy Drew sets out to prove that her father's client was unjustly accused of trying to sabotage the United States space program.

The Hardy brothers' visiting Greek pen pal enlists their help in searching for a priceless ancient Greek helmet loaned to and lost by a Hollywood movie company years before.