When notorious rake Anthony Bridgerton announces that he has chosen a prospective bride, he faces unexpected opposition when his intended's meddlesome sister Kate decides to protect her innocent sister from the wicked aristocrat.

"England, 1865: As one of England's most notorious newspaper columnists, Lady Katherine Bascomb believes knowledge is power. And she's determined to inform and educate the ladies of London on the nefarious-and deadly-criminals who are praying on the fairer sex. When her reporting leads to the arrest of a notorious killer, however, Katherine flees to a country house party to escape her newfound notoriety-only to witness a murder on her very first night....

Enola Holmes, Sherlock Holmes's younger sister and self-declared finder of lost persons and things, is determined to find her friend, Lacy Cecily, a confused young Baronet's daughter on the run from her father's devious schemes.