#3 in the Turing Hopper series. This 2004 entry in the next to last in the series, so the series doesn't have the legs of the author's Meg Langslow series that has 13 entries through 2012. This series though is quite enjoyable and its relatively narrow focus no doubt accounts for it's short life. Although I imagine it could be read as a stand-alone, I would recommend reading it from the beginning - You've Got Murder (2002).
Turing Hopper series - "Artificial Intelligence Personality" Turing Hopper has been monitoring the credit cards of notorious criminal Nestor Garcia, waiting for signs of activity. When suddenly thousands of dollars of purchases begin appearing, Turing traces them to deliveries to a vacant house in northern Virginia. For Garcia to be using his credit card is highly suspicious, so Turing and "her" assistants, including human friends Tim and Maude, start investigating. Tim watches the vacant house, but when a dead body turns up, Tim could well be the police's only real suspect in the murder. Later, someone tries to break into Maude's house, and Turing realizes that a devious plot is unfolding. As Turing works on the puzzle, she observes everything with the wry, witty musings on human-computer relations that make this "techno-cozy" series a true standout.