Jan Willem van den Braak wrote a biography of Ter Braak in 2017, named " (Spy against Churchill). He found out many things about his youth and recruitment in Noordwijk aan Zee, also with the help of family members of Ter Braak and his fiancée and some Dutch files in the National Archive in The Hague. The only English author who describes Ter Braak's recruitment in Noordwijk and his life in Cambridge in more than one page is Joshua Levine in 'Operation Fortitude' (2011).