John Abbot is on the winning streak of his life at a Las Vegas casino when an alien invasion arrives mid-hand, and a crashing spacecraft turns his lucky night into a fight for survival. When the wreckage leaves behind one badly injured alien, Abbot and a ragtag group of fellow casino refugees decide their best shot at stopping the invasion is dragging the creature across hostile ground to Area 51 alive. It's a first-contact story built out of gamblers and cocktail waitresses instead of soldiers and scientists.
Summary by Loreful, from public sources