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.

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

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.

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.

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.

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

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.

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.

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

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

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

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.

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

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

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

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

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