Now with a reimagined look! Set sail to Atlantis with Tim and his friends in the laugh-out-loud funny, highly illustrated fourth book of the New York Times bestselling Once Upon a Tim chapter book series from Spy School author Stuart Gibbs. Tim and his ragtag crew have been rescued from certain doom by a mermaid princess—but now, she wants something in return for saving their lives: her father King Neptuna’s stolen trident. To pay their debt, Tim, Belinda, Ferkle, Rover, and Princess Grace once again brave the Sea of Terror to track down the trident in the glorious city of Atlantis, which hasn’t sunk into the sea yet. (In fact, it is famed as the safest city on earth.) But there is plenty of danger en route—and the notorious Prince Ruprecht is lurking about as well. Can the junior knights evade the scheming royal and complete their quest? Stuart Gibbs is the author of five New York Times bestselling series: Spy School, FunJungle, Moon Base Alpha, Charlie Thorne, and Once Upon a Tim—as well as the new nonfiction series Spy School Secret Files. He has written screenplays, worked on a whole bunch of animated films, developed TV shows, been a newspaper columnist, and researched capybaras. Stuart lives with his family in Los Angeles. You can learn more about what he’s up to at StuartGibbs.com. Chris Choi is an illustrator, author, and graphic novelist who formerly worked under the pseudonym “Chris Danger.” Chris, an army brat, lived everywhere, but grew up mostly in Hawai’i. He attended the School of Visual Arts in New York City, worked in animation and academia for a few years, and has been a full-time freelance illustrator for almost a decade now. He currently lives in Philadelphia with his wife Eva and their dog and two cats. Visit him on Instagram @Choi_Meets_World. CHAPTER  1 WHY I WAS IN DANGER       ONCE UPON A TIME…     My friends and I were tied up in a rowboat, about to plunge over a waterfall at the edge of the earth.   I know this is not the way these stories usually begin.   Believe me, I would have been much happier if our quest had started some other way. Like this, for instance:       ONCE UPON A TIME…   There was a brave young knight-in-training named Tim who woke up safe and sound in his nice, comfy bed to find a hot meal of bacon, oatmeal, and more bacon waiting for him.       Unfortunately, that is not what was happening in my life at this time.   Over the past few days, I had battled a bargleboar, a sea monster, and a hydra; been tortured by the horrendous singing of the sirens; nearly got swallowed by a giant whirlpool; been betrayed by my fellow knights; and been captured by the evil Prince Ruprecht and his horde of nasty pirates, who had put us in that rowboat and sent us to our doom.   All in all, it was a crummy week.   And yet, being a knight-in-training was still better than my previous job.   Before this, I had been a peasant, just like my father and his father and his father and everyone else in the history of my family. Being a peasant was dull and boring, which is why I had jumped at the chance to become a knight.   Being a knight had been very exciting. Quite a bit more exciting than I had expected, in fact. I had traveled to many distant lands, met many unusual people, and nearly died in many different ways.   Obviously, I had survived all those ordeals. But this one looked like it might be different.   You may have noticed that there were three other people and a giant frog in the boat with me.       Belinda was my closest friend, a tough, loyal girl who had pretended to be a boy so that she could join the knights, because, sadly, most people in my time didn’t think girls could do anything except be housewives or witches.   Princess Grace was, well… a princess. The princess of Merryland. People in my time (including Princess Grace’s parents) thought that princesses should do even less than other girls. They were expected to simply wait around the castle for princes to show up and ask to marry them. Princess Grace liked the idea of that even less than Belinda and I liked the idea of being peasants, so she had snuck away to join us on our adventure.   Of course, if she had known how things were going to work out, she might have stayed home.   Ferkle was our village idiot, although he was actually very intelligent. He had only gone into village idiocy because it was the family business.   Rover was not really a giant frog. He was a fr-dog. He had originally been my dog, until the mean witch who lived next door to me got angry at him for digging up her begonias and turned him into a frog. So now he was a frog who behaved like a dog. He could lick your face from ten feet away.   I’m not sure if Rover was worried about the waterfall ahead, but the rest of us certainly were. We had almost reached the lip of it and were about to go over the edge of the earth.   “I know we have been in plenty of dan