When he wakes up in a hospital, William Monk cannot remember anything about himself or his life, not even his own name. He cannot recognize his own face in the mirror. He discovers that he is a police officer, but is afraid that if anyone knows he has lost his memory, he will lose his job. So he bluffs his way through.
Suggested further reading
If you like this book, try the next one in the series, A Dangerous Mourning.
You might also like the Charlotte and Thomas Pitt series.