Barbara Penfield was a normal suburban housewife. She had a normal suburban family; they lived in a normal suburban house. She even took normal suburban antidepressants. The car crash that killed her was assumed a normal suburban tragedy.

But when the evidence made it plain Barbara had been lured from her home and her car had been tampered with, Detective John Mason could only draw one conclusion: Murder.

The greatest mystery was why anyone might want Barbara dead.

Mason finds her murderer, but only with help from an unexpected source.

Unthinkable is the inaugural book in the Mason & Penfield Mysteries.