In 1931, Julia Wallace was murdered in Liverpool and, more than 80 years later, crime novelist P.D. James believes she has cracked the case. Wallace’s husband was convicted, but later won an appeal and went free. He was called on business to an address that didn’t actually exist, and returned to find his wife dead. Was the caller the killer? No, according to James, the initial conviction was correct, and the call was a petty prank, which afforded Wallace a convenient alibi. As in 30 to 70 percent of real-life female homicides, and plenty of fictional ones too — the man did it.