Full title is THE CASE OF THE FRAGMENTED WOMAN and the author listed on the book is Cleo Jones. Hmmmmm.
From the jacket blurb:
When the bodiless head of voluptuous soap opera siren Hermoine Leanders is broadcast live on a local game show, bored housewives all over San Francisco get quite a jolt.
Especially Mary Sable, who then finds Hermoine's foot set prettily in aspic in her best friend's refrigerator.
As parts of Hermoine appear around town, Mary tries to find the killer and save her friend from a murder charge. But juggling three children, unwanted houseguests and a sexy cop isn't easy, especially when her own off-the-wall investigation leads her to a millionaire's kinky basement...and into more trouble than even a bored housewife ever needed.