Worldwar: In the Balance

In this gripping alternate history novel by Harry Turtledove, Earth is embroiled in a massive war among nations, including Germany, Russia, and China, when an unprecedented invasion force appears, led by the formidable Fleetlord Atvar. As humanity faces this inhuman threat with technology far beyond its own, the planet's fate hangs in the balance, pushing nations to confront their divisions and unite. Turtledove masterfully weaves a tale that spans the globe and explores the depths of human resolve in the face of an ultimate challenge, reshaping history and speculating on what the future might hold.