The publisher's special commentary chapter and the author's biography are included in this version.

Bobbsey Twins or Merry Days Indoors and Out is the first book of The Bobbsey Twins Series. The author, Edward Stratemeyer created the series under the pseudonym Laura Lee Hope. The books related the adventures of the children of the middle-class Bobbsey family, which included two sets of fraternal twins as the principal characters: Bert and Nan, who were 12 years old, and Flossie and Freddie, who were six.