Patric Curwen

A master of disguise commits a series of daring crimes. Nobody knows what he looks like. He even masquerades as a doctor and kills his own partner whilst under police protection because he was about to betray him. (imdb)

A retired general helps out by sheltering some evacuees during WWII.

A trio of young boys become involved in a criminal plot.

The heir to a London department store must learn the business, but he must start off by working his way through the various menial jobs incognito first. However, a crooked manager has arranged, for a cracksman, just out of gaol, to join the staff. Each is mistaken for the other.