故事发生在维多利亚时期的伦敦，弃婴海蒂年满5岁，需要从寄养家庭回到孤儿院。在那里，她认识了好朋友波利，尼德。院长除了平时特别严厉，还与人贩子做不正当的交易试图通过贩卖孤儿赚钱。海蒂和朋友们与院长斗智斗勇，并且一边寻找着自己的亲生母亲。海蒂善良，勇敢，聪明，而且对生活满怀希望，这是一部非常励志的喜剧。Set in Victorian-era London of 1887, Hetty and her foster brother Gideon are forced to return to the foundling hospital where she was abandoned by her mother as a baby. Hetty and her friends hate the iron-fist regime of Matron Bottomly and gang leader Sheila. Hetty yearns to escape and go in search of her mother.