The secrets save Oscar, a boy who apparently can not remember how he got into trouble. In the middle of the night happens the unimaginable: Oscar has disappeared - and with it a valuable artifact.
The Fox children spend with Wellington a holiday in Germany. There they meet a girl named Gretel in the woods. With the original notebook by the Brothers Grimm she wants to get behind the mystery of the fairy tale characters.
The help of the Fox children is needed in the Amazon, where the legendary Chaos Butterfly usually ensures peace and order. However, this only applies if he does not hit his wings during a solar eclipse. Otherwise, chaotic weather will break out around the world.
The secrets fly to Africa to bring back Magnon, the talking monkey, his magic magnetic stone. For only with the stone can the monkey open the magical door to his home, the 'lost world'. However, not only Magnon's monkey tribe lives in this secret world, but also many extinct animals. No wonder the Fox kids can not resist taking the magnetstone to the lost world. But even Obsidian Stone is after the stone and now threatens to destroy the world ...
It's Halloween and the secrets are dressing up. Tara finds an old cloak in the attic - a perfect scary costume! As Tara puts on the cloak, she suddenly turns into a fire-breathing dragon. Ironically, Obsidian Stone appears in his zeppelin above the Fox Villa, sucking in all the valuable items with an "artifact magnet". But not only are the secret artifacts in danger, but also Tara. Can she still be saved?
The Fox kids are in search of the magical invisibility bang that Obsidian Stone stole. The four secrets manage to take Stone back from the precious artifact. But he takes revenge on them and abducts Julia ...
Henry and Edward play with Grandpa's creature crystal. When this breaks, they are suddenly in great trouble. Shortly before, they created an insect monster that will not disappear without the crystal ...
The Fox family receives an urgent call for help from Egypt. There was a powerful artifact stolen, the sacred scarab. With him, wizard Nakhti can be brought back to life. And if this succeeds the Scarab Thief, he can control Nakhti and instigate evil deeds. The secret holders must absolutely prevent that!
Tara discovers a theft message on the Internet. An artifact was stolen from a museum: the mole whistle. That sounds like a new case for the secrets! In the museum, they discover the escape route of the thief, which leads directly into the sewer. Under the earth, the secrets await not only stinking sewage, but also nasty mole monsters
Fox's family is called to Louisiana for an emergency. In the Swamp Museum, visitors have transformed themselves by a mishap into will-less swamp monsters. Together with the museum director, the secrets try to break the monster spell.
Tara has the vision of an old lantern. This is an artifact that tells the missing magician Dr. Mesmo belonged. This warns the secrets of the dangerous forces of the lantern ...
Wellington, the butler of the Fox family, suddenly disappeared without a trace. The Mysteries discover some clues that he wants to sell the evil Stone a valuable artifact: a mighty ice crystal from the Himalayas.
The Mysteries are on an important mission in Mexico: they must protect the jewel skull of Acalan. Every one hundred years, the artifact has magical powers for a day. Then his owner gets the power to bring the dead to life. After tricking the rogue Hic, the secrets believe the problem is solved. But little Maria takes the skull secretly to revive her deceased cat. It also awakens Rosalita, the Queen of the Dead, which has its own plans with the jewel skull!
Tara and Charles discover a baby monster in a cave - a mixture of a wasp and a crocodile. It spits corrosive acid and grows at breakneck speed. Henry and Edward find out that it is a "crocose". The secrets must calm it down as soon as possible! But that is only possible with the scent of a very special plant flower ...
The secrets are on their way to a monastery in the Himalayas. There they want to bring a precious artifact to safety: the 'map of fate'. But even Obsidian Stone has it on the map. To steal the secrets, he abducts Tara.
Obsidian Stone has a particularly perfidious plan this time: he wants to steal all the artefacts the grandfather of the Fox family left in a diary. In order to avoid getting in the way of the secrets, he magically shrinks them into tiny miniature editions of their own ...
