"Under Padlock and Seal" by Harold Avery is a children's adventure novel likely written in the early 20th century. The story revolves around a group of siblings—Elsie, Ida, Guy, and their cousin Brian—as they navigate mysterious events in their lives, particularly the enigma of "Uncle Roger's Box." This box, sealed for twenty years, piques their curiosity and serves as a focal point for their explorations and imaginative speculations. The beginning of the narrative introduces Elsie, who is disturbed in the middle of the night by the sound of a grindstone coming from the tool-house. This prompts her to investigate, suspecting her cousin Brian is at work. Despite her brave intent, she hesitates and fears the unknown, leading her to retreat. Later, at breakfast, the family discusses the strange happenings, including the mysterious loss and reappearance of a carving knife, which ties back to Elsie's earlier fright. This sets the stage for a mix of suspense and whimsy as the children seek answers, involving them in a series of curious events that challenge their bravery and problem-solving skills. (This is an automatically generated summary.)