While visiting England the twins halt a thief's plans to steal the crown jewels from the London Tower.

When the Bobbseys go to Japan on a business trip, the twins investigate the case of a missing bracelet and missing man.

If the twins had not returned a strange white box to its owner- if a letter from Athens had not arrived at that very moment- the Bobbseys' surpri

The twins investigate a spooky old house to find a long-lost treasure for an old woman.

When a carnival guard disappears into a candy castle and a trick dog runs away and can't be found, the Bobbsey twins launch into a new mystery.

"Beware Four-winged Blackbird, " is the warning that introduces the Bobbsey twins to mystery in Canada where they search for a missing friend.

A shaggy white dog who performs circus tricks leads the Bobbsey Twins on a new adventure.

The twins go to the country fair and are involved in the mystery of a missing boy.