An alien alliance fleeing a common enemy travels through space seeking a new home. When they reach Earth they warn humanity that the Vagar will reach and attack Earth within a year. Earth’s leaders negotiate a deal with the Alliance. In exchange for their advanced technology and their help in fighting the Vagar they’ll be granted the right to settle on Earth and seek mates among the Earth females.
The Alliance agrees but warns humanity that each Alliance member is a warrior race with its own cultural believes and rituals, but the one need they have one in common is the Mating Challenge. The Challenge is different for each race but any Earth female who volunteers to be the mate of an alien warrior will have to face it. Losing is not an option.