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Jackson and Quigley were this close to joining the FBI (Frosty Bureau of Investigation), until Jackson’s mom found out and they ended up scrubbing seagull poop instead. At least they have Uncle Bryn’s birthday party to look forward to. But when they get to the Ice Cream parlor, the FBI agents are acting strange. Instead of talking, Uncle Bryn and his friends just finish their glowing green ice cream, then jump into a waiting ice cream truck and disappear. It's obvious that something has gone very, very wrong, and now Uncle Bryn is suspected of being a master thief!

Adventure-loving penguin Jackson dreams of being a secret agent like his Uncle Bryn, who works for the Frosty Bureau of Investigation. Jackson and his gadget-inventing best friend, Quigley, might officially be too young to join the FBI, but they aren’t going to let that stop them! They just need to come up with the right plan to prove they are worthy. But when one of Q’s inventions goes dangerously wrong, Jackson suddenly finds himself dropped right in the middle of an FBI stakeout. There’s fishy business afoot at the city’s aquarium....

Following his adventure on the California Comet, artist and amateur sleuth Hal Beck is looking forward to another railway journey with Nat, his journalist uncle - this time riding the historic Safari Star through South Africa. Then the already eventful journey becomes even more so when one of their fellow passengers dies on board!

After his adventure on the Highland Falcon, amateur sleuth Hal Beck is excited to embark on another journey with his journalist uncle. This time, they're set to ride the historic California Comet from Chicago to San Francisco. Hal mostly keeps to himself on the trip, feeling homesick and out of place in America. But he soon finds himself drawn into another mystery when the young daughter of a billionaire tech entrepreneur goes missing!

Jack Gantos' rocket-paced follow-up to the Newbery Medal–winning novel Dead End in Norvelt opens in the 1960s, deep in the shadow of the Cold War and the Cuban missile crisis. But instead of Russian warheads, other kinds of trouble are raining down on young Jack Gantos and his utopian town of Norvelt in western Pennsylvania. After an explosion, a new crime by an old murderer, and the sad passing of the town's founder, twelve-year-old Jack will soon find himself launched on a mission that takes him hundreds of miles away.

When 11-year-old Harrison "Hal" Beck is forced to accompany his travel-writer uncle on the last journey of a royal train, he expects a boring trip spent away from video games and children his age. But then Hal spots a girl who should not be on board, and he quickly makes friends with the stowaway, Lenny. Things get even more interesting when the royal prince and princess board for the last leg of the journey - because the princess' diamond necklace is soon stolen and replaced with a fake!