George is heartbroken when his neighbor Annie and her father move to Florida, but when Annie sends him a message telling him she has been contacted by aliens with a terrible warning, he joins her in a galaxy-wide search for answers.

George travels to the future in the epic conclusion of the George’s Secret Key series from Lucy Hawking. When George finds a way to escape the spacecraft Artemis, where he has been trapped, he is overjoyed. But something is wrong. There’s a barren wasteland where his hometown used to be, intelligent robots roam the streets, and no one will talk to George about the Earth that he used to know. With the help of an unexpected new friend, can George find out what—or who—is behind this terrible new world, before it’s too late?

George and Annie are off on another cosmic adventure inspired by the Mars Expedition in the fifth book of the George’s Secret Key series from Stephen and Lucy Hawking. George and his best friend, Annie, have been selected as junior astronauts for a program that trains young people for a future trip to Mars. This is everything they’ve ever wanted—and now they get to be a part of up-to-the minute space discoveries and meet a bunch of new friends who are as fascinated by the universe as they are. But when they arrive at space camp, George and Annie quickly learn that strange things are happening—on Earth as well as up in the skies. Mysterious space missions are happening in secret, and the astronaut training they’re undertaking gets scarier and scarier…

Join George and Annie as they explore the galaxy in this cosmic adventure series from acclaimed scientist Stephen Hawking and his daughter Lucy Hawking. This complete collection includes: George’s Secret Key to the Universe George’s Cosmic Treasure Hunt George and the Big Bang George and the Unbreakable Code George and the Blue Moon George and the Ship of Time

George and Annie are off on another cosmic adventure to figure out why strange things are happening on Earth in the fourth book of the George’s Secret Key series from Stephen and Lucy Hawking. George and his best friend Annie haven’t had any space adventures for a while and they’re missing the excitement. But not for long, because seriously strange things have started happening. Banks are handing out free money, supermarkets aren’t able to charge for their products so people are getting free food, and aircrafts are refusing to fly. It looks like the world’s biggest and best computers have all been hacked. And no one knows why… It’s up to George and Annie to travel further into space than ever before in order to find out what—or who—is behind it.

Join George and Annie as they explore the galaxy in this cosmic adventure series from acclaimed scientist Stephen Hawking and his daughter Lucy Hawking. George’s parents, who have always been wary of technology, warn him about their new neighbors, especially the girl George’s age, Annie, who seems to be following in her scientist father’s footsteps. But when George befriends them and Cosmos, their super-computer, he finds himself on wildly fun adventures through the galaxy that explore themes of physics, evolution, environmental conservation, and time travel. This complete paperback collection includes: George’s Secret Key to the Universe George’s Cosmic Treasure Hunt George and the Big Bang George and the Unbreakable Code George and the Blue Moon George and the Ship of Time

In their bestselling book for young readers, noted physicist Stephen Hawking and his daughter, Lucy, provide a grand and funny adventure that explains fascinating information about our universe, including Dr. Hawking's latest ideas about black holes. It's the story of George, who's taken through the vastness of space by a scientist, his daughter, and their super-computer named Cosmos. George's Secret Key to the Universe was a New York Times bestseller and a selection of Al's Book Club on the Today show.