Black Widow by Christopher Brookmyre

Diana Jager is clever, strong and successful, a skilled surgeon and fierce campaigner via her blog about sexism. Yet it takes only hours for her life to crumble when her personal details are released on the internet as revenge for her writing.

Then she meets Peter. He's kind, generous, and knows nothing about her past: the second chance she's been waiting for.

Within six months, they are married. Within six more, Peter is dead in a road accident, a nightmare end to their fairytale romance.

But Peter's sister Lucy doesn't believe in fairytales, and tasks maverick reporter Jack Parlabane with discovering the dark truth behind the woman the media is calling Black Widow...