Scents and Sensibility - Spencer Quinn - Bog

"Private Investigator Bernie Little and his canine companion Chet return home to encounter some alarming developments. First off, Bernie's wall safe--normally hidden behind the waterfall picture in the office--is gone, and with it Bernie's grandfather's watch, their most valuable possession. And next door, old Mr. Parsons is under investigation for being in possession of a saguaro cactus illegally transplanted from the desert. Bernie and Chet go deep into the desert to investigate. Is it possible that such a lovely old couple have a terrible secret in their past?"--Amazon.com.