Three-year-old Elisa's new rag doll goes along on the adventures she and her seven-year-old brother Russell have with friends and family in their apartment building and outside.
Five-year-old Russell goes to nursery school and has various adventures which show he is growing up, but sometimes he wishes he could still stay home like his baby sister.
Bolivia looks forward to the new experiences as she starts middle school while spending six months with her great-aunt and uncle, but her friends Rory and Derek want to keep Bolivia all to themselves.
Fifth grader Derek and his best friend Rory are delighted when their neighbor's niece Bolivia comes to town for another visit, until a lot of missing objects make Derek begin to doubt Rory's honesty.