Lost (Land of the Lost Book 1‪)‬

To reconnect his family after the death of his wife, Dr. Rick Marshall takes his two children, Will and Holly, on a rafting trip down the Colorado River, in hopes to bring them closer together. When a massive earthquake strikes, tearing a hole between time and space, their trip turns disastrous as they are plummeted over a thousand-foot waterfall and into a perilous prehistoric world filled with savage dinosaurs and dangerous creatures. Now, they must fight for their very lives as they struggle to survive and find a way back home...if there’s a way back home.