No Suspicious Circumstances (Unabridged‪)‬

Meet the world's most unusual undercover team. It can be tough working for HM Revenue & Customs, but DJ Smith has more than a little help from her trained sniffer cat, Gorgonzola, a moth-eaten Persian with gourmet tastes and a mind of her own.
This first investigation finds DJ and Gorgonzola on the trail of a heroin smuggling ring operating in and around Edinburgh. Their first port of call is the White Heather Hotel, owned by the formidable Morag Mackenzie, who rules her domain, and her husband, with steely efficiency.

Beneath the innocent surface of the country house hotel eddies a sinister undercurrent, and soon one death leads to another.