Summer vacation turns into an adventure for the three Nichols sisters when Mr. Gilbert Chesterton and his wife come to town. Eleven year old Claire hopes to write a detective story. Eight-year-old Cece wants to be a champion roller skater. And 10-year-old Joanne just want to learn how to play the locked piano in the family living room. But as a befriend the Chestertons, skating accidents, surprising friendships, puppet shows, and mystery solving ensue!