Eloise Mintumble spends several days lost in 1402

In an experiment with time travel, she is trapped in 1402. She interacts with a number of people in that era which causes massive changes in the time stream, even affecting people in the current time. Twenty-five people in the present simply vanish, having never been born. The following Tuesday lasts for two and a half days, and the following Thursday only a couple of hours. Her experience results in very strict laws being enacted by the Ministry about meddling with time.