Jack Minot and Janey Pecq are best friends who live next door to each other. They are always seen together, so Janey gets the nickname of Jill, to mimic the old rhyme. The two do go up a hill one winter day— and then suffer a terrible accident. Seriously injured in a sledding accident, they recover from their physical injuries, while learning life lessons along with their many friends. They are helped along their journey to recovery by various activities created by their mothers.