Arrest me - Pro:vzglyad

One evening, a woman goes to a police station to confess the murder of her abusive husband, committed many years ago. Only the most continuously Police questioned the woman, she knows more than his life, the less it wants to stop. Why is this woman that nobody suspected she absolutely wants to be convicted? Why does the police she absolutely not stop? One of the two will win. But what does it mean to win in such circumstances?