Dink Duncan and his two friends investigate the apparent kidnapping of famous mystery author Wallis Wallace.

While picnicking on Squaw Island, Dink, Josh, and Ruth Rose find a hundred dollar bill, and when they return to explore further they find an entire cave full of money.

Third-grader Dink and his detective friends hope to receive a big reward by finding the person whose video recorder picked up a picture of the local bank robber.

Seven-year-olds Bradley, Brian, Nate, and Lucy make observations and gather clues that convince them that their older siblings, cousin, and animals have been captured by hungry space aliens.

The Deadly Dungeon
Dink’s favorite mystery writer, Wallis Wallace, has invited Dink, Josh, and Ruth Rose for a sleepover—in a haunted castle! Will they discover who—or what—is haunting Moose Manor?
The Empty Envelope
Dink keeps getting envelopes in the mail addressed to “D. Duncan.” But the letters inside all start with “Dear Doris” and don’t make any sense! Josh and Ruth...

The Absent Author
A is for author.... Dink writes to his favorite author, mystery writer Wallis Wallace, and invites him to visit Green Lawn. To Dink's amazement, Wallace says he'll come! But when the big day arrives, Wallace is nowhere to be found. The police think he just missed his plane, but Dink suspects foul play. It's up to Dink and his two best friends, Josh and Ruth Rose, to find the famous writer—before it's too late!
The...

K is for Kidnapped!
Someone has kidnapped the king and queen of Socotra. For safety's sake, their son is staying with Dink until they are safe. But then the prince is kidnapped, too! Can Dink, Josh, and Ruth Rose unmask the royals' enemies before it's too late? Or is the royal family of Socotra gone forever?
L is for Lucky. . . .
And that's just how Lucky O'Leary feels when the lottery ticket his grandfather sends him for

...

It's November, and the younger siblings of the A to Z Mysteries detectives have a new mystery to solve. ''The twins' new neighbors are up to something! It's Thanksgiving, and a mysterious couple has moved in next door. Bradley, Brian, Nate, and Lucy must work out the clues: The neighbors have built a tall wooden fence. They've bought some strange parts for making . . . something. They've even put up a suspicious tent in their backyard, with a big,...

THE HAUNTED HOTEL
H Is for Haunted . . . A ghost has checked into the Shangri-la Hotel! It’s almost Halloween, and
reports of strange sounds and even stranger sights are coming from Green Lawn’s only hotel.
Every day, more and more guests are being scared away. Dink, Josh, and Ruth Rose must
figure out what’s going on and catch the ghost—before Green Lawn turns into a ghost town!
THE INVISIBLE ISLAND
I Is...

When Ruth Rose and her friends, vacationing in Florida, discover that her grandmother is about to invest in a project to recover sunken treasure, they stumble upon evidence that the entire plan may be a fraud.