In 1933, eighteen-year-old Gretchen, niece of Adolph Hitler, reunites with her Jewish boyfriend when she leaves the safety of England to return to Germany to investigate a murder and expose the evil of the Nazi regime. The girl known as Gretchen Whitestone has a secret: she used to be part of Adolf Hitler's inner circle. But she made an enemy of her old family friend and fled Munich, living now in England, posing as an ordinary German immigrant,...

Dink and his friends unearth the mysterious truth behind the envelopes incorrectly delivered to his house.

On a winter vacation in Jamaica the Hardy boys begin a dangerous adventure when an ancient bronze death mask is discovered near their beach house.

The search for missing gold takes the Hardy boys to the Yucatan Peninsula where they uncover a second mystery.

Nancy Drew witnesses a purse snatching and runs after the thief. She rescues the purse, but not its contents, then is asked by the owner, a doll collector, to do some detective work. Readers will enjoy Nancy's clever ways of finding all she seeks, and bringing happiness to a misunderstood child and her lonely grandmother.

While helping the police find the owner of a mysterious house with a crooked staircase and an unpredictable robot, Nancy Drew, girl detective, also helps capture a swindler.

When two suspicious plane accidents occur near an eastern airport, the two Hardy brothers investigate the case and find themselves in greater danger than they anticipated.

The boys once again have jumped into the thick of a complicated mystery. Samuel Blacksone and his brother Ruel Rand live on adjacent properties, and it appears that one of them is out to hurt the other because they are both attacked. Frank and Joe soon learn that treasure is rumored to be hidden between the two properties, and as they investigate, they learn that others are involved in the apparent plot between the two brothers. Spooky mansions, secret...

Nancy Drew must use clues in a dead man's letters to find some unpublished musical manuscripts that will save an old man and his granddaughter from financial ruin.

While trying to recover a set of stolen parchment paintings, Nancy Drew becomes involved in tracking a kidnapper and extortionist.