Frank and Joe unravel clue after clue in this adventure-packed search for the living descendant of the mighty Aztec nation which once ruled Mexico. Juvenile fiction.

A series of bizarre events in their home town lead the Hardy Boys on a trail of robbers and kidnappers.

After Mandie and Celia hear suspicious noises coming from an alley on their way back to schol one night, and thinking that it is somehow connected to a missing heirloom, Mandie decides to investigate.

Nancy Drew tries to find a clue to the strange tapping sounds in the house of a retired actress.

Everyone else in the village is afraid of the creature who supposedly dwells at the top of Kneeknock Rise but young Egan investigates for himself.

Ten brief cases allow the reader to match wits with ten-year-old crime-buster, Encyclopedia Brown, as he investigates such cases as whether a diary of George Washington's mother is authentic, or if a UFO picture supposedly taken by the army is real.

When brothers Simon, Henry, and Jack move with their parents to Arizona, they are irresistably drawn to explore the aptly named Superstition Mountain, in spite of warnings that it is not safe.