The house of secrets
Nina Bawden
While staying with their aunt in an English seaside town, the Mallory children find a secret passage into the mysterious old house next door, where their efforts to help a strange girl lead to trouble and adventure.

by Josh Lacey (2011)
Tom goes with his Uncle Harvey to Peru, where they narrowly escape imprisonment and death as they hunt for buried treasure after tracking down a journal written by John Drake, a young relative of Sir Francis Drake, on a voyage to Lima in 1577. Includes biographical information on John and Francis Drake.
Nina Bawden
While staying with their aunt in an English seaside town, the Mallory children find a secret passage into the mysterious old house next door, where their efforts to help a strange girl lead to trouble and adventure.
Helen Moss
When thieves raid the house of a neighbour, Emily, Jack and Scott are ready to investigate. But, strangely, the neighbour doesn't seem to want the thieves to be caught! The burglars didn't escape with much this time but could the raid be connected to a much older crime involving millions of pounds? The friends begin to uncover the truth, but are they leading themselves into serious danger?
Tom McCaughren
Four young boys find adventure involving ghosts and buried treasure when they set out to discover the secret behind the old legend of the golden key.
David D. Connell and Jim Thurman
Mathnet detectives Kate Monday and George Frankly use math skills like triangulation and scale to find a buried treasure in a ghost town.