In 1939 art historians rediscovered Willem van Tetrode, a sculptor born in Delft. At that time, it became clear that he and a sculptor known in Italy as Guglielmo Fiammingo were one and the same. His athletic, well muscled bronzes were models for Goltzius and Rubens. The book's 3 sections are dedicated to sketching his life and work, reporting on the spectacular X-ray studies made of his bronzes, and reconstructing his masterpiece: the Count of Pitigliano's art collection from 1560 that features 20 of Van Tetrode's sculptures.