Used book – The Next Accident, Lisa Gardner

Tess thought she had found the ideal husband in Jim Beckett, a police officer with an excellent reputation in the small town of Williamstown, Massachusetts. But two years after their marriage, she discovers that her husband has raped and murdered several women. Despite her fear, Tess reports him to the authorities. While awaiting trial, Jim is placed in a high-security unit. The day he escapes, killing two police officers, he has only one idea in mind: to find the one who betrayed him and remind her that, whatever happens, they are united until death do them part...