The Bobbsey Twins are back at school after summer vacation, but Danny Rugg, the school bully, is up to mischief again--and this time he's trying to pin it onto Bert. Bert gets accused of freezing a giant snowball to the school steps, and all the evidence seems to point against him. Christmas is coming too, and the Bobbsey Twins are busy planning for their trip to Snow Lodge--where a lost treasure, a restored friendship, and exciting adventures await. (Summary by Adele de Pignerolles)