Chase James Hadley. The Soft Centre

Val Burnett was the attractive daughter of a multimillionaire. Her pleasantly organised life had been cruelly shattered when her husband, Chris received severe brain injuries in a car crash. While convalescing in Florida, Chris disappeared for twenty-four hours, leaving no message or trace of his whereabouts.
During the same night an attractive blonde was found brutally murdered in a second-rate motel, her body hideously mutilated. But while the police were searching for the murderer, an unscrupulous private investigator discovered evidence that Chris was the monster responsible for the killing.
Threatened with blackmail, but determined to prove her husband's innocence, Val set out to trace Chris's movements of the night of the murder and found herself on the trail of a maniac who didn't need a motive to kill again.