Trillby & Chadwick is a clandestine cocktail bar in central Helsinki, designed to transport guests back to the Prohibition era. Concealed behind an unmarked wooden door on Katariinankatu, patrons must locate the entrance and use a vintage telephone to request access, enhancing the bar's secretive allure. Upon entry, visitors find themselves in a meticulously crafted setting reminiscent of a 1920s private investigator's office, complete with leather armchairs and dim lighting, evoking the ambiance of an old English gentleman's club. The bar's menu is thematically structured around fictional case files, offering a selection of inventive cocktails that pay homage to classic mixology while incorporating modern twists. Trillby & Chadwick operates under a strict no-photography policy to maintain its enigmatic atmosphere, encouraging guests to fully immerse themselves in the experience. The establishment is part of the Son of a Punch Collective, known for creating unique and immersive bar experiences in Helsinki. Reservations are recommended for groups of four or more, while smaller parties are accommodated on a first-come, first-served basis. The bar's popularity peaks around 11 PM on Saturdays, with guests typically staying for approximately 2.5 hours.