When some stray magic throws you 20 years into the past with no warning and no visible means of return, you know you're having a bad day.

Hermione Granger is an Unspeakable specializing in time. After collaborating with co-worker Percy Weasley to decrease the number of casualties from the war, she is in a constant battle against the Keeper of Time, who wishes to restore the original timeline. Her final test involves traveling back to 1979, where her mission is horrifying yet hilariously simple.