The case is not that straightforward.
A bank is robbed and officers Joe Friday and Bill Gannon investigate. They find the getaway car deserted, and they trace it back to the woman from whom it was stolen. However, when they talk to the woman whose car was stolen, she matches the description of the woman who was with the robber and they notice she has an envelope with parole documents on her kitchen table.
They take the woman to headquarters where she changes her story and says she was kidnapped by the bank robber and made to help in the bank robbery. She also says that her run in with the law in Oklahoma was because of her husband's criminal activity. So here we have a woman who only tells the truth when forced, who has a criminal ex-husband, and claims she was forced to participate in a bank robbery when that would only greatly complicate matters for said bank robber.
So they release the woman and follow her to see if she meets up with the robber. Instead the case takes a startling turn, but of course our two protagonists never look startled. There is even a finale involving karate. I almost expected to see BAM! POW! CRASH! ZAP! On the TV screen.
Not just another episode of Dragnet. One of the stranger turns is every time the suspected woman is on the screen there is sirenish/romantic music playing, even though she is not romantically interested in anybody and is respectably dressed. The 60s were such a transitional era.