Anika is sent an unusual birthday present – a miniature pyramid wrapped inside a torn treasure map. Sal discovers they are tied to a long-lost Aztec treasure – and an ancient curse. A new mystery has begun!

Sal and Anika meet a nervous boy in the forest. While Anika befriends him, Sal is convinced he is a thief. But when the two of them confront him, he reveals a secret they never would have expected.

The Hunter kids put on a diamond exhibition to lure their nemesis out of hiding.

The Hunters discover a secret room in the house. A clue sends Tess on the trail of a mysterious figure.

Max & Tess track the mysterious Rinus through Amsterdam and discover a cryptic notebook. Back at the Hunter house the other kids make a mess while trying to cheer themselves up.

The kids begin to unravel the mystery around the missing red diamond. Max keeps a secret from his siblings.

The Hunter kids must band together to outwit one of their biggest opponents.

Distant relatives Aunt Hedwig and Uncle Eugene are brought in to look after the Hunter children. The kids worry their relatives are more interested in the Hunter fortune than helping the family.

The Hunters attempt a high stakes exchange to rescue their parents while working to outwit Aunt Hedwig and Uncle Eugene.

A new foster couple temporarily takes in Anika and Sal while Max and Tess uncover news about the blue diamond.

The Hunters make a huge breakthrough but also suffer a big setback as they get closer to their ultimate goal.

Max wakes up in his new foster home to discover his foster parents have vanished. Max and his new brothers and sisters embark on an adventure to find them.

The Hunters stay home from school to search for their missing parents and find more than they were expecting in the Hunter House Library. Anika leads a museum tour.

Max and Tess follow a clue to an Amsterdam cemetery where they uncover an old family secret and unknown key. Meanwhile, Anika has suspicions about the new cleaning lady.

Tess and Max work together to trick their foes. Anika doesn't want to celebrate her birthday.

Max tracks a possible suspect while the other kids search the house for new clues. Anika takes on an unlikely mission.

The final villain is revealed as the kids race to solve the last clues and unlock the mystery.

When Max gets into trouble at school, the headmistress decides she must speak with his foster parents.The kids scramble to distract her from their absence.

A mysterious message helps the Hunter kids track down the elusive 'Magpie' but it may be too late as others suspect the kids are home alone.

Tess journeys into a maze of underground tunnels to find the red diamond. Max has to conquer his fears. The Hunters get a surprise visit. Max and Tess meet with the hooded figure.

When the discovery of an old map points the kids' towards the red diamond, Max makes a secret deal with a nemesis.

The Hunter kids capture a surprising trespasser and must hide their new guest from Tim and Simone.

The Hunters discover a cryptex, but Erik secretly takes it before they can find out what's inside. Max hears from his birth parents. And the police accuse Eric of art theft.

Erik is taken to the police station, where Daniel tries to find the evidence against him. Max talks to his birth parents.The police arrive to search the house.

The kids find the stolen puzzle box and try to hide it from the police. Erik returns home but is acting suspicious. Daniel finds a clue in the museum footage. After tough goodbyes, Max leaves for Spain.