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.

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