The novel "The Lost Treasure 2" is a thrilling adventure story that follows a group of treasure hunters as they search for a long-lost treasure. The story begins with the group, consisting of protagonist Jack, his sister Lily, their friend Sasha, and a team of experienced treasure hunters, arriving at a remote island believed to hold the treasure. As they start their search, they encounter numerous challenges and obstacles including treacherous terrain and rival treasure hunters. As they dig deeper, Jack and his team discover clues and secrets abou