sentences:  The sequel to this book, continuing the story of Percy Blakeney, is "The First Sir Percy".In March 1623, the Dutch nobleman Willem van Oldenbarnevelt, Lord of Stoutenburg, is on the run.His father, the statesman Johan van Oldenbarnevelt ("John of Barneveld" in the book) was falsely accused of treason and sent to the gallows by the Stadtholder, Maurice of Nassau, Prince of Orange in 1619; and his brother Reinier van Oldenbarnevelt, the lord of Groeneveld, has since been arrested and executed for plotting to kill the Prince.