Fool me once by Harlan Coben

If your husband was murdered, And you were a witness, How do you explain seeing him on your nanny cam? You thought you trusted him. Now you can’t even trust yourself. Dark secrets and a terrifying hunt for the truth lie at the heart of this gripping new thriller. To find the answer, Maya must finally come to terms with deep secrets and deceit in her own past before she can face the unbelievable truth about her husband – and herself.