arrived, also blinking dark water as it rose out of the stream, right in front of the Baudelaires. At first it seemed to be the eye of some terrible sea creature, found only in books of mythology and in the swimming pools of certain resorts. But as the toboggan took them closer, the children could see that the eye was made of metal, perched on top of a long metal pole that curved at the top so the eye could get a better look at them. It is very unusual to see a metal eye rising up out of the rushing waters of a stream, and yet this eye was something the Baudelaires had seen many times, since their first encounter with an eye tattoo on Count Olaf's left ankle. The eye was an insignia, and when you looked at it in a certain way it also looked like three mysterious letters. "V.F.D.!" Sunny cried, as the toboggan drew even closer. "What is it?" Klaus asked. "It's a periscope!" Violet said. "Submarines use them to look at things above the water!" "Does that mean," Klaus cried, "that there's a submarine beneath us?" Violet did not have to answer, because the eye rose further out of the water, and the orphans could see that the pole was attached to a large, flat piece of metal, most of which was under the water. The toboggan drew closer until the periscope was in reach, and then stopped, the way a raft will stop when it hits a large rock. "Look!" Violet cried as the stream rushed around them. She pointed to a hatch just at the bottom of the periscope. "Let's knock, maybe they can hear us!" "But we have no idea who's inside," Klaus said. "Taykashans!" Sunny shrieked, which meant "It's our only chance to travel safely through these waters," and she leaned down to the hatch and scraped at it with her teeth. Her siblings joined her, preferring to use their fists to pound on the metal hatch. "Hello!" Violet cried. "Hello!" Klaus yelled. "Shalom!" Sunny shrieked. Over the sound of the rushing stream, the Baudelaires heard a very dim sound coming from behind the hatch. The sound was a human voice, very deep and echoey as if it were coming from the bottom of a well. "Friend or foe?" it said. The Baudelaires looked at one another. They knew, as I'm sure you know, that "friend or foe" is a traditional greeting directed at visitors who approach an important place, such as a royal palace or a fiercely guarded shoe store, and must identify themselves as either a friend or a foe of the people inside. But the siblings did not know if they were friends or foes for the simple reason that they had no idea who was talking. "What should we say?" Violet asked, lowering her voice. "The eye might mean that it's Count Olaf's submarine, in which case we're foes." "The eye might mean that it's V.F.D.'s submarine," Klaus said, "in which case we're friends." "Obvio!" Sunny said, which meant "There's only one answer that will get us into the submarine," and she called down to the hatch, "Friend!" There was a pause, and the echoey voice spoke again. "Password, please," it said. The Baudelaires looked at one another again. A password, of course, is a certain word or phrase that one utters in order to receive information or enter a secret place, and the siblings of course had no idea what they should say in order to enter a submarine. For a moment none of the children said anything, merely tried to think, although they wished it were quieter so they could think without the distractions of the sounds of the rushing of water and the coughing of fish. They wished that instead of being stranded on a toboggan in the middle of the Stricken Stream, they were in some quiet room, such as the Baudelaire library, where they could sit in silence and read up on what the password might be. But as the three siblings thought of one library, one sibling remembered another: the ruined V.F.D. library, up in the Valley of Four Drafts where the headquarters had once stood. Violet thought of an iron archway, one of the few remnants of the library, and the motto that