"‘This is not my world. Something is wrong, askew. It is a Monday evening in October. I am Ellie Falkner, 34 years old and married to Greg Manning. Although two police officers have just come to my door and told me he is dead... ’ It's devastating to hear that your husband has died in a horrific car accident. But to learn that he died with a mystery woman as his passenger is torment. Was Greg having an affair? Drowning in grief, Ellie clings to Greg's innocence, and her determination to prove it to the world at large means she must find out who Milena Livingstone was and what she was doing in Greg's car. But in the process those around her begin to question her sanity ... and her motive. And the louder she shouts that Greg might have been murdered, the more suspicion falls on Ellie herself. Sometimes it's safer to keep silent when someone dies..."

Another psycological thriller like the couple Nicci French usually delivers.
We follow Ellie as she tries to prove that her husband was not having an affair (and as even the police says, proving a negative is almost impossible), and she does everyhting that is necessary to it, lie, pretend to be another person, snoop around, and draws the police attentions to herself. I think the final discoveries were the "easy ones", not really a surprise or a very strange motive and conclusions, but it closes the story.
The books are always quite depressing, the whole atmosphere is suffocating and at least I always end them feeling disturbed. It's not a good feeling but it means the books are well written, right?