While staying at the Crooked House, the family home of their housekeeper Mrs. McGregor, the Aldens try to solve a riddle that will lead them to a hidden treasure.

"The wedding of Griffin "Cat" Thorne and Anne Ross is on! Or is it? Captain Tobias Dredd, the infamous pirate "Toby Scratch," has been scouring the South Pacific, searching for Father Carroll, a member of the clandestine holy warriors known only as The Brethren. When Dredd's ship, The Red Corsair, levels a Brethren monastery, Declan Ross and the crew of The Robert Bruce are called upon to pursue Father Carroll and maintain his safety at all costs....

Arriving in Brazil while dealing with squabbling family members, Geronimo Stilton must help his friend Isabela find a mysterious emerald.

"After Séverin's seeming betrayal, the crew is fractured. Armed with only a handful of hints, Enrique, Laila, Hypnos and Zofia must find their way through the snarled, haunted waterways of Venice, Italy to locate Séverin. Meanwhile, Séverin must balance the deranged whims of the Patriarch of the Fallen House and discover the location of a temple beneath a plague island where the Divine Lyre can be played and all that he desires will come to pass....

Coyote tries to trick his friends when they set off to find buried treasure, but Coyote ends up the victim of trickery too.

When the Thea Sisters visit Egypt to help look for the legendary ancient Treasure of the Sun, they discover that thieves are also after the hidden treasure, and it's up to the sisters to stop them.

Luke McCallister's quiet life was shattered when he finds a human skul, and possibly the key to Glory, Wyoming's oldest mystery. A hundred year ago a band o outlaws buried thier gold in Glory. The one surviving badit took the secret of the hiding place to the gallows. That man was Angie Sommer's great-great grandfather, and she's come to Glory to see -- with Luke's help -- if the legend is true. Luke and Angie set off in search of a mystery as...

Ben and Jake battle alligators, quicksand, and a murderer when they search for buried treasure on an island in a swamp.

Pete and his friends plan to find the treasure of Snake Island before the grown-ups, but first they have to get past the snake that is guarding it.

The discovery of an old map by his sister Thea leads Geronimo and his family to search for buried treasure on a faraway island.