The great train mystery / Lewman, David

SpongeBob and Patrick investigate onboard a train when the key to the vault containing the Krabby Patty's secret recipe is stolen.

When Mr. Krabs gives SpongeBob the only key to the vault holding the Krabby Patty's secret recipe, SpongeBob and Patrick must keep it safe, until it is stolen by a passenger on their train.

SpongeBob and Patrick investigate onboard a train when the key to the vault containing the Krabby Patty's secret recipe is stolen.