Two sets of twins catch a thief while tracking down a missing suitcase in a train station

When a famous sculpture is stolen from the museum, two sets of twins team up to track down the thief.

Two sets of twins launch a wild chase when the "disappearing parrot" in their school talent show magic act really does disappear.

In an extraordinary day at the beach, after winning a sand castle contest, two sets of twins resolve the mystery of the disappearance of a rich woman's dog.

This volume describes and lists series published for young people from early elementary grades through high school. Fiction series from 1976 through 1990 (and n