My Sister Died on the Mistress' Operating Table

From the back cover

When her sister is rushed into surgery after a car accident, Seraphine calls the one person she trusts: her husband, Lucian Crowther, a renowned surgeon. He swears he will operate himself. Instead, he hands the scalpel to Ivy Marchand, an intern who has not even graduated, and retreats to the corner to revise her thesis. When Ivy cuts into the patient's brain and the bleeding will not stop, she flees into Lucian's arms. He glances at the flat line, pats her head, and tells Seraphine to prepare for her sister's funeral. Then he leads Ivy away, leaving Seraphine to bury her grief alone.

But the body on that table is not her sister. It is Helena, Lucian's own sister, and he does not know it. Seraphine orders a divorce agreement instead of a lawsuit, watches Ivy post a candlelit confession online, and collects screenshots as evidence. Lucian blocks her, protects his mistress, and secretly seizes the corpse to prevent an autopsy. When he finally comes home with Ivy and hands Seraphine a box of ashes, he still has no idea whose life was lost under Ivy's scalpel.