Adventure in Blackmail (1942)

Peter Conway is a playwright and his new play is having its first night. At the party afterwards, Peter is kissed by a woman he claims not to know. The woman is Pamela. At first, she persuades him but then produces some letters where he declared his undying love for her and she sues him for Breach of Promise. But Peter has a nice scheme to defeat her plan - he marries her. She then does her best to bankrupt him. But why does she want to destroy him?