"I Made A Mistake" by Jane Corry

They said: 

In Poppy Page's mind, there are two types of women in this world: those who are faithful to their husbands, and those who are not. Until now, Poppy has never questioned which she was.

But when handsome, charming Matthew Gordon walks back into her life after almost two decades, that changes. Poppy makes a single mistake - and that mistake will be far more dangerous than she could imagine.

Someone is going to pay for it with their life . .

What I thought: