"Bill Bolton and Hidden Danger" by Lieutenant Noel Sainsbury, Jr. is a novel likely written in the early 20th century. The story follows the adventures of the title character, Bill Bolton, a resourceful and fearless young man, as he navigates a dangerous situation involving his friend Charlie and a group of mysterious assailants. The narrative appears to blend elements of adventure, mystery, and youthful heroism, appealing to those who enjoy action-packed stories centered around determined characters. The opening of the novel introduces Bill Bolton as he is startled from sleep during a summer storm, only to realize he is under fire from unknown assailants. His friend Charlie has sneaked into his room, having narrowly escaped after being targeted. Bill quickly takes charge of the situation, determining to evade the attackers. As the two boys engage in a stealthy escape plan involving Bill's amphibious plane, they discuss the mysterious circumstances surrounding Charlie’s father, Mr. Evans, who is entangled in something dangerous that warrants their immediate attention. The stage is set for thrilling escapades and an unfolding mystery that intertwines their fates with hidden dangers ahead. (This is an automatically generated summary.)