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 Sir Steve Stevenson (2013)
Agatha Mistery, a twelve-year-old detective with a photographic memory, travels to Egypt, where rumors of a mysterious tablet unearthed in the Valley of the Kings may be just the clue that she needs to unlock the secret curse of an ancient pharaoh. Agatha Mistery, a 12-year-old detective with a photographic memory, travels to Egypt, where rumors of a mysterious tablet unearthed in the Valley of the Kings may be just the clue that she needs to unlock the secret curse of an ancient pharaoh. Book #1
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.
Bob Schaller
While Ashley and Adam Arlington are on vacation with their parents in Florida, they help solve an old mystery that involves the Seminole chief Osceola, the Spanish explorer Ponce de León, and the Castillo de San Marcos, a fort in Saint Augustine.
Enid Blyton
A little shadowing practice by George goes awry and his parents force him to resign from the Secret Seven. Scamper is installed as his temporary replacement. Some shadowing by Colin puts the Seven on the trail of a man who shoves dogs down a coal hole.
Carolyn Keene
The Dean of Emerson College enlists Nancy to investigate the thefts of a valuable substance being used in a top-secret experiment. But when Nancy discovers that the experiment involves biological mutations, she knows she must find the culprit before the lives of everyone on campus are endangered.