While vacationing on a houseboat, the Bobbsey Twins help Will Watson, who is running away from his mean employer Mr. Hardee.

The twins help solve another mystery. This time one about a shiprecked sailor's return from the sea and his search for his lost family.

During their Christmas stay at Snow Lodge, the twins try to clear a man of a theft that occurred years ago and bring two relatives together.

"While on a trip to New York City, the Bobbsey twins meet Jack Whipple, a man who works on an estate outside their hometown. The twins help the old man to find his long-lost brother and sister, as well as to catch the man who had robbed the estate and then cast the blame on Whipple." --

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

Mrs. Bobbsey and the twins visit Jamaica and learn that their friend, Phil Henderson, has disappeared. During their search for Phil, the twins stumble across pirate treasure.

The Bobbsey twins' vacation in Colonial Williamsburg takes an exciting turn when they catch a thief, discover a howling monster, and find an old American flag hidden during the Revolution.

The money donated to the Mini-Marathon to help the hungry has been stolen. Can the twins find the real thief?