Stranger is a cocktail bar in a basement beneath Restaurant Tranquilo in Gothenburg. Visit Sweden says the entrance is semi-secret. Inside, the bar is styled after American speakeasies of the 1920s and 1930s, with evocative music and carefully designed lighting. The menu offers cocktails with flavours the listing says are intended to surprise and impress. It describes the bartenders as skilled and passionate. Drink prices are not stated in the Visit Sweden entry, so a bill cannot be estimated from it.

Stranger frequently welcomes guest bartenders and sometimes holds cocktail competitions and other events. The entry gives no dates for upcoming guest shifts or competitions, and no opening times. It also does not say how long a visit usually takes. A visit is centred on ordering cocktails and spending time in the speakeasy-inspired basement setting. If an event is taking place, guests can also come for a guest bartender or cocktail competition. The entrance is beneath Restaurant Tranquilo, though the listing describes it only as semi-secret, without further directions.