Sybilla Forsenstrom doesn't exist. For fifteen years she has been excluded from society and, as one of the homeless in Stockholm, she takes each day as it comes, keeping all her possessions in her rucksack - apart from a knife and salami which she stores in a smart briefcase. She is always well-dressed and displays impeccable manners. One night, in The Grand Hotel, she charms a susceptible businessman into paying for her dinner and room. His dead body is discovered the following morning and Sybilla becomes the prime suspect. When a second person is killed in similar circumstances, she becomes the most wanted person in Sweden.