The cat sitter's cradle : [a Dixie Hemingway mystery] / Blaize and John Clement.

Enhanced descriptions from Syndetics:

Blaize Clement won fans all over the world with the charm and wit of her pet-sitting mysteries. Now, with the help of her son, author John Clement, Blaize's beloved heroine Dixie Hemingway is back for yet another thrilling adventure in this critically-acclaimed series.
Dixie has built a nice, quiet life for herself in the sleepy town of Siesta Key, a sandy resort island off the coast of Florida. In fact, her pet-sitting business is going so well she's even taken on part-time help: Kenny, a handsome young surfer who lives alone in a rickety old houseboat. But things get a little messy when, on an early morning walk in the park with a client's schnauzer, Dixie makes a shocking discovery. Hidden among the leafy brambles is a homeless girl, alone and afraid, cradling a newborn baby in her arms.
Dixie takes the young girl under her wing, even though she's just been hired by Roy Harwick, the snarky executive of a multi-national oil company, to care for his equally snarky Siamese cat, Charlotte, along with his wife's priceless collection of rare, tropical fish. It's not long before Dixie stumbles upon a dead body in the unlikeliest of places, and soon she's set adrift in a murky and dangerous world in which no one is who they appear to be.
Smart, fast-paced and entertaining, The Cat Sitter's Cradle is a perfect illustration of why
Dixie's loyal fans have come to know and love her and eagerly await the next installment of her adventures.