WHEN IS A WHITE ALLIGATOR A RED HERRING? Okay, granted, an albino alligator on the loose in San Francisco is pretty darn exciting. But my two cats, Rupert and Isabella, and I have better things to do than tail a reptile from Nob Hill to Fisherman's Wharf. We're investigating the mysterious Steinhart brothers, the 1900s-era benefactors who provided the original funding for Clive the alligator's aquarium. Follow the money, as my uncle Oscar used to...