As Colin and Mary continue their miraculous transformation, the narrative highlights the necessity of maintaining their secret from the household staff at the manor. Dickon, serving as the bridge between the children and the outside world, reports to his mother, Mrs. Sowerby, that the children are becoming "plumper and rosier every day." However, the looming presence of the servants and the doctor poses a significant threat to their progress. To protect their secret, Colin and Mary engage in a strategic act of "play acting." Colin adopts his usual persona, complaining and acting like a "weak, pitiful thing," while Mary plays along, allowing them to escape to the garden where they can finally burst into "good, healthy laughter." Mrs. Sowerby correctly identifies this joy as being "better than pills any day."
Feeding two growing, active children presents a logistical challenge, as their increased appetites threaten to alert the suspicious servants and the doctor. The doctor’s intention to "write Mr. Craven about it" creates genuine fear in Colin, who is desperate to keep his recovery a surprise for his father’s return. Mrs. Sowerby steps in as a guardian angel, offering to provide "fresh milk, extra bread, and currant buns." When Dickon arrives with the "two tin pails"—one filled with "rich creamy milk" and the other with buns wrapped in a "checkered napkin"—the children’s gratitude is palpable. Colin’s remark that Mrs. Sowerby must have "the magic in her" underscores the theme that kindness and thoughtful action are the true catalysts for healing, transcending mere medical intervention.
As the children grow stronger, their curiosity expands beyond the garden walls. On a "dreary day" when rain forces them indoors, Mary suggests exploring the "mysterious old house with its hundred rooms." This exploration serves as a metaphor for their own emotional awakening. They navigate through "new hallways, staircases, pictures, and strange old things," including a room filled with "little ivory elephants." This curiosity mirrors the mystery of the "locked garden," suggesting that the house itself holds secrets just as profound as those found in nature.
One of the most poignant moments in the chapter involves the portrait of Colin’s mother. Colin reveals that he has uncovered the painting, which was previously hidden behind a curtain. He describes a moment of profound connection, claiming that when he saw the moonlight on the portrait, it felt "like magic filled the room" and that his mother seemed to be "laughing because she was glad to see me standing up." Mary, observing the striking resemblance, tells Colin, "You look so much like her now, like her ghost made into a boy." This realization brings a sense of hope to Colin, who begins to believe that if he carries the likeness of his mother, his father might finally be "fond of me."
In conclusion, this chapter illustrates that healing is not merely physical. Through the nourishment provided by Mrs. Sowerby, the laughter shared between the children, and the reclamation of family history, Colin and Mary are being transformed into individuals capable of love and connection, preparing them for the ultimate reveal of their new, healthy selves.