Asking to leave a school bus, Cliff, a young teenager, collapses and dies in the snow near the roadside. His math teacher is asked to notify the parents and then write a short obituary. Although he barely knew him, his teacher is intent on unraveling the mystery of the untimely death.

The Invaders, alien beings from a dying planet. Their destination: the Earth. Their purpose: to make it their world. David Vincent has seen them, for him it began one lost night on a lonely country road, looking for a shortcut that he never found. It began with a closed deserted diner, and a man too long without sleep to continue his journey. It began with the landing of a craft from another galaxy. Now, David Vincent knows that the Invaders are here, that they have taken human form. Somehow he must convince a disbelieving world that the nightmare has already begun.

The tale of trail boss Gil Favor and his trusty foreman Rowdy Yates as they drives cattle across the old west. Along the way they meet up with adventure and drama.