This is a monograph and catalogue raisonné of the brothers Corneille and Paul Theunissen. The authors noted that this work was made possible by the discovery of an archive containing over 1,500 photographs, drawings and documents. The first section is dedicated to the life and career of Coreille. It includes a discussion of his early artistic training, his photographs, workshop practices, and a catalogue raisonné of his sculpted works. This is followed by the catalogue of Paul Theunissen, with a discussion of his training at the academy of Valenciennes and the Beaux-arts in Paris. There is also a catalogue raisonné of his sculptures and monuments.