Novel. name: cant remember. heroine: nurse. married. no sex with hubby. abused as kid. strange powers. help!?

Hi ya'll. I hadnt sent a question before and so i didnt know where to put this initially The heroine of this novel was the product of a gang rape. her mum abandoned her to her older sister. she was increasingly abused over a period of years and finally locked away in a cellar. she was only saved when the house above was burned down one day with her aunts family in it. she grew up to be a pretty nurse. married a police officer, but refused to have sex with him all that while: in fact, when he forcibly tried to make love to her at the end, he went insane. She used to set herself up to be raped so that she would use her strange powers to kill off intended molesters. it is my fault that i cant remember the name or the author, but was was kinda young when i read it. can someone help me out here? i read it in 1991 and again in 2000. about 800 pages in paperback, if that helps.

she used to be an ugly duckling until one night when she almost drowned in a pool, came out alive, and with a new life. husband was a cop who was investigating the brutal murders of suspected rapists... not knowing his wife was the person using her strange powers to brutally dismember the guys when they tried to hit on her while she used to stay out late at night in the parks. sorry for the bother..but i will really love to get the name...

i cant remember either

not a lot of laughs in it then, huh.

I've Googled this , but cant find a specific answer, a lot comes up as The Accused, but that was a film with Jodie Foster and doesn't match your description. Bear with me, I'll try and update.