Five run away together by Enid Blyton

The provided text consists of excerpts from a chapter book, likely part of the Enid Blyton series Five Go Adventuring Again, detailing the start of a holiday for four cousins—Julian, Dick, Anne, and George—along with George's dog, Timothy. The children arrive at George's home, Kirrin Cottage, only to find that her parents have been called away because her mother is ill, leaving them in the care of the extremely unpleasant Stick family (Mrs. Stick, Mr. Stick, and their son, Edgar). To escape the Sticks and their threat of poisoning Timothy, the children execute George’s secret plan to run away to Kirrin Island where they set up camp in a hidden cave. While on the island, they discover that the Sticks are also there, using the old castle dungeons for a secret purpose, which the children realize is tied to smuggling and a kidnapping plot involving a girl named Jennifer. The children ultimately rescue Jennifer and help the police capture the Sticks, allowing them to resume their adventurous holiday on the island