Trish accidentally time travels to Lieutenant-Colonel Custer’s army camp during its final preparations for the 1873 Yellowstone Expedition. Luckily for her, she has her old-style flip cell phone with her, along with a ballpoint pen and plastic reading glasses. Even luckier, she is befriended by the regiment’s surgeon, who is officially in charge of her. He soon believes her story that she is from the future, and quickly realizes he can profitably take advantage of her knowledge of modern medicine – and future inventions, from automobiles to X-rays. But his female assistant is not as enamored with Trish as he is, finding her to be a real pain to deal with. Trish’s 21st century idioms and crudely blunt language make her a misfit in the crowd of 19th century Army officers and young soldiers– although they certainly enjoy being around her! Trish also discovers how time machines work.