In 2008, Drenth et al. published a paper on Single Grave Culture settlements in the Netherlands. In their conclusions, they drew attention to the numerous sites that had not yet been fully analysed and published, pointing out that ‘these sites will generate new and important information about a fascinating era from our prehistory without anyone needing to pick up a spade’.1 Now, six years later, our project ‘Unlocking Noord-Holland’s Late Neolithic treasure chest: Single Grave Culture behavioural variability in a tidal environment’ has filled an important gap in our knowledge, with the analysis and publication of three sites: Keinsmerbrug, Mienakker and Zeewijk. These results have been achieved thanks to the Odyssey programme funded by the Netherlands Organisation for Scientific Research and the Ministry of Education, Culture and Science, The publication before you focuses on the Zeewijk site, excavated in three campaigns in 1992, 1993 and 1994. Only 15-20% of this very large site was uncovered, but it nevertheless yielded many finds and numerous features (postholes, cow hoofprints and ard marks, occurring over a large area of about 1 ha). Zeewijk became renowned for the discovery of a large enigmatic structure with wooden stumps that were extremely well preserved. The publication of this ceremonial structure twenty years ago made Zeewijk famous among archaeologists abroad. Unlocking Zeewijk was quite a different matter from re-examining the fairly small sites at Keinsmer brug and Mienakker. The large size and huge quantity of finds, the fact that the area was only partially excavated and the potential for sample selection within the project made for very different conditions, but the new results and interpretations make Zeewijk just as fascinating. The five years spent tackling the backlog in the analysis and publication of three important sites presented us with a serious challenge. However, this was above all a very pleasant journey, working closely together in a team with all kinds of specialists from different institutions and companies to reveal as much as possible about the Late Neolithic communities in the northwestern Netherlands. The final result of this close collaboration is an intriguing new story of Late Neolithic life at Zeewijk, which in many ways differs from Keinsmerbrug and Mienakker. This unlocked trio shows that a lot can indeed be done without picking up a spade, but there are still numerous aspects to be explored. In a way, it is a great comfort that the treasure chest still holds so much to be discovered. Thanks to all who took part in this project for their efforts and cooperation, and we hope our readers enjoy perusing this book on Zeewijk.