Nothing But the Truth (1941)

Gwen Saunders teams up with her uncles employee Steve Bennett in an attempt to double her 10000 investment in the family firm If she can reach the 20000 mark her uncle TT Ralston will match the figure Steve bets that if he can spend an entire day without telling a lie Ralston and his business partners must double Gwens money Bennett then earns the enmity of everyone involved in his attempt to win the bet