Here's Blood in Your Eye — Manning Long

Liz Boykin, beautiful model, has become engaged to a wealthy socialite. Her one fear is that knowledge of a former love affair will end the romance. To make things really difficult, the former lover is murdered at a party which she is present -- after she's written him a compromising letter! Only the efforts of the District Attorney can save Liz, and he's so attractive that she's not sure in the end if she cares about her rich boyfriend knowing her past.