Synopsis: A dying criminal confesses that his loot has been stored "in the tower." Both towers of the looted mansion are searched in vain. It remains for the Hardy boys to make an astonishing discovery that clears up the mystery and clears the name of a friend’s father.

Synopsis: Not only is the local bank robbed, but two of the Hardy boys' pals mysteriously disappear after a masquerade party. Are the events related? How the Hardy boys use all their courage and skill to outwit the criminals provides an exciting climax to one of the most baffling mysteries the young detectives have ever encountered.

Synopsis: Nancy and her friend Helen visit their friend Emily Willouby at the Lilac Inn, which Emily now owns, to help her plan her wedding. Emily plans on selling inherited diamonds in order to help fix up the Lilac Inn. However, Nancy soon learns that someone has been impersonating her and making expensive purchases under her name. Soon after, Emily's diamonds are stolen! Can Nancy find the thieves and recover the missing diamonds?

Synopsis: Frank and Joe Hardy are investigating a mysterious old house high on the cliffs above Barmet Bay when they are frightened off by a scream. The boys return to the apparently haunted house when they make a connection between the place and a smuggling case their father is working on. When their father goes missing, they have to investigate the caves beneath the house and confront the smugglers.

Synopsis: Suspects who are identical twins...A leaking tent...Magical worm pills...A zebra's portrait...And a sheet of toilet paper from Spain that's been swiped!These are just some of the ten brain-twisting mysteries that Encyclopedia Brown must solve by using his famous computer-like brain. Try and crack the cases along with him--the answer to all the mysteries are found in the back!

Synopsis: Cam Jansen is a crack detective with a photographic memory. Together with her friend Eric, she solves every mystery that comes her way.

Synopsis: The Dry Creek Middle School drinking fountain has sprung a leak, so principal Walter Russ dashes off a request to Flowing Waters Fountains, Etc. asking"...We need a new drinking fountain. Please send catalog. "Florence Waters responds:"I'd be delighted. . . But please understand that all of my fountains are custom-made."And so begins the hilarious chronicle, in letters, cards, transcripts, and official town documents, as collected by Mr. Sam N.'…

Synopsis: Cam Jansen uses her photographic memory to track down a thief at the circus

Synopsis: When Brother begins hanging out with the Too Tall Gang, they draw him into their ring of stealing, lying, cheating, and especially smoking, and the Bear Scouts and Gramps help Brother resist the habit. Original.