"The Reptile Room" is the second book in the A Series of Unfortunate Events by Lemony Snicket. It follows the Baudelaire orphans as they move in with their new guardian, Dr. Montgomery Montgomery, a kind herpetologist who studies reptiles. The orphans are excited to explore his fascinating collection of snakes and lizards. However, their happiness is short-lived when Count Olaf, their villainous relative, disguises himself to infiltrate their new home. The story unfolds with suspense and adventure as the Baudelaires must outsmart Olaf to protect themselves and their new guardian from danger.