Mariner's Inn is a riverside inn on the show Penny Dreadful. Situated on the River Thames near the London Docks, it benefits from steady trade from sailors and stevedores alike. Long time resident Brona Croft resided here, also plying her trade as a lady of the night.
Mariner's Inn was the site of a grisly event that came to be known as the Mariner's Inn Massacre. On a night of the full moon Warren Roper and Mr. Kidd accosted Ethan Chandler in an attempt to bring him home to Ethan's father. Unbeknownst to the pair, Chandler was a werewolf, and once his lupine nature took hold there was little to stop him running amok in the establishment. Roper was later found alive, but carrying horrific injuries from the incident, the sole survivor after the rest of the bar patrons met their end in a savage mauling. The inn was promptly shut down as a crime scene investigated by Scotland Yard inspector Bartholomew Rusk.