Äls, a young woman from Sweden living in Hamburg in the summer months, attracts a newly married explorer, Albrecht Froben, who has just returned to his native city. But although Äls seems to be 'life itself', she suffers from a tropical disease which is slowly killing her. Froben is torn between Äls and his wife Octavia, who he seen as a kind of 'heavenly' counterpart to the earthy and beguiling Äls.