My Husband's Mistress Killed His Dad, and He Had No Clue

My husband Michael's father and my own father shared the same name—Robert. His was Robert Carter; mine, Robert Smith. I once thought it a sweet coincidence, until that 3 AM phone call turned this quirk of fate into a living nightmare.
The nursing home called to say Robert Carter had died, but when Michael returned from his business trip, he assumed it was my father who had passed. "Old Robert's finally gone," he smirked. "Should've moved him to the cheaper nursing home ages ago." Can you believe it? His own father—the man who'd left him an inheritance—and there he was, helping his medical intern mistress cover up malpractice, dismissing the death as "just some useless old man."
He has no idea he's protecting his father's killer. No clue I've seen through his cold-bloodedness all along.
I wonder, when the truth finally hits him, how will this absurd tragedy end?