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.
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.
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.
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.