Nancy and her friends Bess and George spend an exciting week exploring a mysterious zigzag house with its fantastically crooked staircase, its bizarre serpent picture, and an unpredictable robot that nearly causes the young detective to lose her life. But despite the threat of danger from the robot, Nancy is determined to solve the mystery of the weird house and to locate the missing owner who is wanted by the police. It takes keen logic and quick thinking for the young detective to plow through the tangled thicket of clues and find the key to this complex puzzle. With the help of her friends, Nancy captures an elusive swindler and uncovers the secret of the crooked banister, but not before they have several hair-raising adventures – one on a broken bridge over flaming water, another in a hidden room with poisoned portraits!

Nancy becomes involved in a double mystery concerning a haunted bridge and jewel thieves.

The Hidden Window Mystery: Nancy and her friends, Bess and George travel to Charlottesville, Virginia in search for a missing stain-glass window.

Nancy, George, and Bess must locate the missing sunglasses that once belonged to rock star Eric Stanley or they may not get a chance to enter the River Heights singing contest.

Another great installment in a New York Times bestselling series! In #20: Getting Burned the local animal shelter burns down, and if it doesn't find the money to rebuild, Rackham Industries will buy the land and build another warehouse. Nancy is sure the fire was arson even though police and fire chiefs agree it's merely a case of faulty-wiring. She's determined to save the shelter and there are only two ways to do it: 1) prove that someone from Rackham Industries caused the fire, or 2) raise enough money so the shelter can afford a new building. . .