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A young orphan, afraid of being sent to the workhouse, finds himself at the mercy of the unsavory owner of a tavern in Alexandria, Virginia, while he tries to solve the mystery surrounding his past and a missing twin.

Bradley, Brian, Nate, and Lucy follow clues to find whoever left a rabbit in their first-grade classroom on Valentine's Day, because they are worried the rabbit will get sick and die of loneliness.

When three leprechaun statues disappear just before St. Patrick's Day, Bradley, Brian, Nate, Lucy, and other friends follow clues in order to prove that Lucky O'Leary is innocent of the crime.

As a Father's Day gift to the twins' Dad, Bradley, Brian, and their cousins Lucy and Nate try to identify and stop whatever creature is biting fruits and vegetables in the garden.

Bradley, Brian, Nate, and Lucy try to help out the Flying Fortunatos, an acrobatic troupe with a very shabby traveling circus, by identifying the marvelous, hooded trapeze artist they spied rehearsing.

Emma is shocked to learn she has a twin sister, Sutton, but on the day the girls are supposed to meet, Sutton is killed, and Emma risks everything to slip into her twin's life and try to bring the killer to justice.

The twins investigate the disappearance of a person at Sea World.

The twins investigate a stolen computer disk on a cruise ship.

On Saint Patrick's Day, the twin Dixon sleuths become involved in a mystery unfolding right next door.

After moving from London to an old mansion on the English coast, eleven-year-old twins Jason and Julia discover that their new home has twisting tunnels, strange artifacts from around the world, and a mysterious, locked door.

Eleven-year-old twins Jason and Julia, along with their friend Rick, find themselves in ancient Egypt in search of an important map after going through a magical door in their old English mansion.

Braving a series of dangerous situations, Nancy attempts to solve the mysteries of a singer being cheated out of royalty payments and a buried treasure to which the only clue is half of a locket.

The twins investigate when their friends disappear on Halloween in a fun house called Creepy Castle.

The twins investigate attempts to sabotage Ashley's campaign to become the leader at a cheerleading camp.

The twins investigate attempts to sabotage the rock band in which they are playing.