THIEF SPA is the spa of the design hotel The Thief on Tjuvholmen, by the Oslofjord. It has a Finnish sauna, a steam room built around a salt crystal, a 12-metre heated relaxation pool and Sensory Sky showers, and guests can swim in the fjord from a private bathing jetty a stone's throw away. Outside guests can book 90-minute entry Monday to Wednesday, 10:00 to 19:00, for NOK 595. Swimwear is mandatory, and the minimum age is 16.