"The Mystery of the Blue Train" is a captivating detective novel by Agatha Christie, first published in 1928. Set against the backdrop of glamorous train travel in the early 20th century, the story follows the investigation of Hercule Poirot, the renowned Belgian detective, as he unravels the perplexing murder of Ruth Kettering aboard the luxurious Blue Train. With a cast of intriguing characters and a web of secrets and betrayals, Poirot navigates through the twists and turns of the case, uncovering hidden motives and unexpected revelations along the way. As the investigation delves deeper into the tangled lives of the passengers, including jewel thefts and romantic entanglements, Poirot must use his keen intellect and astute powers of observation to solve the mystery and unmask the true culprit behind the crime. With its intricate plot and ingenious plot twists, "The Mystery of the Blue Train" is a classic whodunit that keeps readers guessing until the very end.