Like so many of Dr. Fenimore's adventures, trouble starts with a harmless idea. From his train window, the good doctor sees a single shell gliding on the surface of the Schuylkill River in Philadelphia, an image that stirs up fond memories of his rowing days. Rowing had been the perfect antidote to the hectic rush of medical school, and he wonders why he ever gave it up. He could also use some exercise, as Jennifer, his significant other, broadly...