J. J. Donovan is sitting on the beach, his back against a palm tree, watching the sun rise over the Caribbean. He wears the self-satisfied expression of a man who spent half the night reveling with his ex-wife. Donovan and his ex, Kate Byrne, have been enjoying a romantic vacation in the U.S. Virgin Islands. As he sips hot tea and watches the colorful spinnakers on sailboats dancing out beyond the barrier reef, he has no way of knowing that his close...