Cousin Kelly's Family Secret

Identical twins Jessica and Elizabeth Wakefield can't wait for their cousin Kelly Bates to visit. They're going to have a triple-good time, because Kelly looks enough like them to be their sister.

When Kelly arrives a few days before Thanksgiving, she seems sad about something. Jessica and Elizabeth want their cousin to be happy, but how can they help Kelly if she won't tell them what's wrong? What is the big secret Kelly can't share with her cousins?