Fountain of Death — Jane Haddam

"BRING YOUR BODY..."
reads the health club flyer, "to the Fountain of Youth Workout Studio -- Be a New You for the New Year!" And co-owners leggy Magda Hale and her dashing husband, Simon, are busy signing up a slew of New Haven women eager to be younger, thinner, fitter. But the session gets off to a rather unhealthy start when the body of a weight-training instructor -- stark naked and lethally poisoned -- is found in the bushes behind the club.

For ex-FBI agent Gregor Demarkian, called in to investigate by a New Haven cop, it's shaping up to be a very strange case indeed. And the mystery will only deepen when the great detective finds himself up against a police contact who's less than helpful, a balcony as fragile as tinsel, and a murderer who keeps toasting the season in arsenic -- for the sake of a macabre Auld Lang Syne.