"The Bobbsey Twins On A Houseboat" is a children's book written by Laura Lee Hope, originally published in 1915. The book is part of a series that follows the adventures of two sets of fraternal twins, Bert and Nan, and Flossie and Freddie. In this installment, the Bobbsey family decides to spend their summer vacation on a houseboat. The children are excited about the adventure of living on the water and exploring the river. However, things quickly become mysterious and thrilling when they discover a locked room on the boat and begin to suspect that there may be a thief on board. As they investigate the mysterious happenings, the Bobbsey Twins encounter a variety of interesting characters, including a river pirate and a runaway boy. Along the way, they learn valuable lessons about friendship, trust, and perseverance. The book is filled with fun and adventure, and it provides young readers with a glimpse into a bygone era. With its timeless themes and relatable characters, "The Bobbsey Twins On A Houseboat" is a classic that continues to be enjoyed by children today.