Set against the backdrop of China's Cultural Revolution, a secret military project sends signals into space to establish contact with aliens. An alien civilization on the brink of destruction captures the signal and plans to invade Earth. Meanwhile, on Earth, different camps start forming, planning to either welcome the superior beings and help them take over a world seen as corrupt, or to fight against the invasion.

#1 New York Times bestselling novelist Maggie Stiefvater dazzles in this mesmerizing portrait of an irresistible heroine, an unlikely romance, and a hotel—and a world—in peril. JANUARY 1942. THE AVALLON HOTEL AND SPA offers elegance and sophistication in an increasingly ugly world. Run with precision by June Hudson, the hotel’s West Virginia born-and-bred general manager, the Avallon is where high society goes to see and be seen, and where the mountain sweetwater in the fountains and spas can wash away all your troubles. June was trained by the Gilfoyles, the hotel’s aristocratic owners, and she has guided the Avallon skillfully through the first pangs of war. Now, though, the Gilfoyle family heir has made a secret deal with the State Department to fill the hotel with captured Axis diplomats. June must convince her staff—many of whom have sons and husbands heading to the frontlines—to offer luxury to Nazis. With a smile. She also must reckon with Tucker Minnick, the FBI agent whose coal tattoo hints at their shared past in the mountains, and whose search for the diplomats’ secrets disrupts the peace June is fighting so hard to maintain. Hers is a balancing act with dangerous consequences; the sweetwater beneath the hotel can threaten as well as heal, and only June can manage the springs. As dark alliances and an elusive spy crack the polished veneer of the Avallon, June must calculate the true cost of luxury.