As Husbands Go by Susan Isaacs

A witty mystery involving an upscale wife, her murdered husband, and who in the world would murder a plastic surgeon. Susie Gersten is the mother of active triplet boys, and the wife of Jonah, a craniofacial plastic surgeon. One morning she wakes up to find that her husband had never come home the preceding night. She couldn't be more surprised when his body is discovered in a call girl's apartment. As the investigation begins, her husband's relatives start showing up to help her. When the police seem to be suspecting Susan, her in-laws send their high-priced attorney. Eventually Susan's Grandmother Ethel arrives from Florida and takes things in hand.
The charm of this book is that Isaacs represents Susie's inner turmoil so believably. The situations are just barely over-the-top, making for a very funny tale of family, love, and life.