Martine van Os

2008

• [ ] Sinterklaas: The Secret Of The Big Book (Pieta / Zuster) 

2009

• [ ] Sinterklaas: The Vanished Presents Boat (Pieta) 

2010

• [ ] Sinterklaas: The Mystery Of The Presents (Pieta) 

2011

• [ ] Sinterklaas: A December 5th Mystery (Pieta)