The author and philosopher Søren Kierkegaard died on the 11 th of November 1855. He was 42 years old and died after having been ill for almost eight weeks. He died at Frederiks Hospital in Copenhagen. In the book there is a short mention of Søren Kierkegaard’s work and fundamental view of religion, of Frederiks Hospital, of the doctors who treated him and – something never done before – a textual criticism, interpretation and commentary on his case-book. From the research on the case-book it is explained which illnesses he definitely did not suffer from, and a suggestion is made about the probable cause of his death.