1st Volume of the Spy Vogteren series.
Sofie lives in a lovely house with her mother, father and little brother.
She has a birthday and her uncle, as she has not seen in a year, suddenly shows up and Sofie becomes very surprised while ecstatic happy.
Uncle is a spy and tells Sofie a story from her last mission.
Later in the evening, uncle gets a confidential message.
He explains Sofie, he has to leave them again, but it will only be a couple of days and they will really enjoy themselves.
But Uncle does not return home and Sofie begins to wonder.
As all hope seems to be off, Sofie seeks help from a local person who helps her out on a journey that can only be blowing.