The Promise

S1, E16: Miss Rottenmeier is allergic to cats and when she discovers the two kittens brought by Heidi, she gets really angry. She punishes Heidi and forces her to spend the afternoon in the cellar while she sends Sebastian to drown the kittens in the canal. To save the kittens, Clara helps Heidi getting out of the cellar and Heidi runs after Sebastian for him not to drown the kittens.