Miocene Dawn

On the 13th September 2025, the luxury cruise liner Vinland Majesty with five thousand passengers and crew slipped twenty million years back in time to the Miocene.
There is no way back. They only have food for a few days. The engines, which provide all the ship's electricity, only have fuel for a couple of weeks after which the water purification systems will no longer work. To survive they will have to leave the ship and go ashore, where they will face giant prehistoric mammals, terror birds and the threat of starvation, but the most dangerous threat of all may have come from the twenty first century with them...