With the assistance of a group of Otto Frank 's trusted colleagues , they remained hidden for two years and one month .
In the published version , names were changed : The van Pelses are known as the Van Daans , and Fritz Pfeffer as Albert Dussel .
With the assistance of a group of Otto Frank 's trusted colleagues , Van Daans remained hidden for two years and one month .
In the published version , names were changed : The van Pelses are known as the Van Daans , and Fritz Pfeffer as Albert Dussel .