Truth and Consequences by Alison Lurie

An energetic and attractive forty, Jane Mackenzie is the administrative director at Corinth University’s Center for the Humanities. Unfortunately, her formerly healthy and athletic husband Alan, a history fellow at the center, has suffered a debilitating back injury and is becoming more and more dependent on Jane. But with the arrival of Delia Delaney, a pre-Raphaelite beauty, bestselling writer, and the newest celebrity at the center, Alan gradually begins to recover, becoming well enough for a not-so-harmless liaison. Meanwhile, Jane, who all her life has tried to be a good woman, finds herself falling in love with Delia’s husband.

Hardcover, 2005

Goodreads: 3.28