Frank Carlson Library

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

The Bobbsey twins stay on a Pennsylvania farm and become involved with a mysteriously vanishing prowler and a search for a golden birthday present.

The twins solve a baffling mystery, make several people happy, and return a homeless St. Bernard puppy and a stuffed fox to their rightful owners.

A vacation turns into an investigation of a haunted school house and a chase after a kidnapped monkey.

Two sets of twins receive a message in a fortune cookie that warns them to beware of a man in a blue hat.

Elizabeth collaborates on a school play with her friend Sophia Rizzo, even though her parents tell her to stay away from Sophia, whose brother has been in reform school.