Armchair Fiction presents extra large editions of classic science fiction double novels. The first novel, "The Sinister Invasion" is an exciting adventure classic by one of the science fiction genre's most beloved authors, Edmond Hamilton. It was strange...how easy it was to step right out of your own life, right out of the familiar Earth you'd always known, and into a cosmic mystery That's what happened to Ross Birrel, and it all started by opening the door to his own apartment He soon found himself in the role of a most unlikely undercover agent-an agent with one specific purpose: to uncover an alien spy ring right here on Earth. Only it wasn't that simple, and Birrel soon discovered there was an alien threat far more sinister than anyone on Earth could have imagined. But the key to the mystery depended on whether or not he could trust a female alien-a beautiful woman from beyond the stars who might be a friend to Earth...or its worst enemy. The second novel is "Operation Terror" by sci-fi great Murray Leinster. The radar complex had picked up the strange object in space just as it neared the Earth's surface. It was described as "an object of considerable size." The impact of its landing at Boulder Lake Park, Colorado was felt on every seismograph around the world. Then, the first reports began to trickle in: there were "creatures" on board-creatures who soon left their ship and began exploring the area...Where was the ship from, and what was the quest of the strange visitors-these visitors who were armed with a terrifying paralysis ray that blinded its victims, filling their nostrils with a reptilian odor of the jungle? Only one man in the area could hope to solve the mystery of these aliens-aliens who had come to call Earth "theirs."