Nothing But the Truth 1941 Stockbroker T T Ralston has promised his niece Gwen to double it if she can raise 20,000 for charity But he connives so those she asks refuse to give her more than the 10,000 shes already raised Gwen secretly gives T T s new partner Steve Bennett the 10,000 and asks him to double it Later in a discussion with T T , business partner Dick and client Van, about truth in business Steve bets the 10,000 that he can tell the truth for 24 hours Having already accepted an invitation for a weekend on T T s houseboat, Steve is subjected to 24 hours of attempts to get him to lie or divulge the bet, which would lose him and Gwen the 10,000