From The Perry Mason TV Show Book
Perry doesn't want to get involved in a family dispute when a childhood friend, Eileen Harrison, seeks a divorce from her husband, Danny. Perry feels differently about defending Danny, though, when the man is framed for murder.
+The dispute revolves around Danny's commitment to Teaching -- his "Noble Calling" -- which doesn't pay enough to support his family. Mike Bedard 6.3.16 MeTV viewing.

Sadly, Even today teachers moonlight and take summer jobs summer jobs still holds true today. mikemcs1 7/2019