— J.M. Barrie, The Little Minister
Hurt by the cruel words and mockery of her cousin and classmates, Sarah decides to exact revenge. Aided by her impish cousin Felix, she forges a letter which indicates that Felicity and one of the other girls, Sally Potts (who were born on the same night in the same hospital) were accidently switched at birth by the frazzled nurse. They only mean to play a trick on the two girls, but the situation quickly spirals out of control when the letter makes it into the hands of the girls' mothers- Janet King and Clara Potts. Panicked and in denial, the two women find themselves arguing the completely opposite point that they had earlier with Hetty: that giving birth is not the only thing that makes one the mother of a child.