This is the second volume of the comprehensive account of excavations at Knowth, part of the Brugh na Boinne complex of ancient burial grounds which includes Dowth and Newgrange. It follows the first monograph with a report on further aspects of the prehistoric settlements which have been excavated since 1989. These include evidence for Earlier and Later 'Western' Neolithic habitation, Passage Tomb settlement, Grooved Ware activity and Beaker settlement. Future volumes in the Knowth series will examine the large Passage Tomb, megalithic art and later activity on the site, which includes Iron Age, Early Christian, Medieval and post Medieval settlement. This volume is vibrantly illustrated with site plans and detailed drawings of finds and photographs. There are extensive appendices on the petrological study of pottery, suggested reconstruction of the Grooved Ware structure, and seed and animal bone analyses.