Plot: Why did Special Security Operations Coordinator Cor Ardon receive a letter from US President Barack Obama and what did it say? What does a canopy do in the attic of the Ridderzaal and what was the secret of Herman Tjeenk Willink in the formation of the first purple cabinet? Splinter Chabot shows how the renovation of the Binnenhof is progressing and how it is built on the turbulent foundations of the past.