Paracelsus in Switzerland is the most expensive rehab in the world, serving a clientele of royalty, politicians, oligarchs, business tycoons and A-list celebrities. Forget the £20,000-a-month celebrities spend at The Priory in Surrey, or the £41,700 they shell out for 45 days at the Meadows in Arizona - a five-week residential rehab here costs a whopping £315,000 – about ten times the average UK annual salary. Staying at a lakeside villa in Zurich with 24/7 limousine transportation, a personal chef, a butler and a concierge, clients have access to a five-star hotel spa and a live-in therapist (who sleeps in the spare room). Activities include tennis, yoga, martial arts, weightlifting, massage and more. We sent writer and model Sydney Lima there to see if it could help her kick her partying lifestyle. But while she was there, she uncovered a strange, unexpected world.