Description: While the Q is out of his cave, Thomas Quick sneaks in and steals a Latin medical text and some potions, bringing them to the kids at the tree house, seeking their help to save a girl in the village from a grave illness. With help from Helen, Su Ying and Anna travel to the village to help the girl, Mary Quire, slipping into her house to attend to her. Meanwhile, having discovered the theft, the Q orders the Prime Minister search every house in the village for the person responsible. When the girl's father, Emmett Quire, discovers the girls in his house, they are able to convince him they are friends, as is Tom Quick who risked his life to help Sally. When the guards arrive to search the house, Emmett refuses to allow them in, putting his trust in Tom and the girls. Unsuccessful in the search of the village, the Prime Minister issues a proclamation: if the thief does not come forward, six villagers will be sent to Malo. With Sally recovering after having been given medicine for malaria, the kids return the stolen items and deliver a message to the Prime Minister, confessing to the theft to keep the villagers safe.