There are 2 books in the Daria Vinci Investigations series. The newest book is Roman Roulette which came out in 2022.

1
Red Riviera

Book cover of Red Riviera
Its jaws open wide, a firefighting seaplane skims the glittering Gulf of Portofino on Italy’s jagged Ligurian coast, scooping up a lone swimmer named Joe Gary. The super-rich, retired Italian-American has mob connections and a dirty political past. Has he been snatched by accident or murdered? Red Riviera, Commissioner Daria…
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2
Roman Roulette

Book cover of Roman Roulette
Roman Roulette: Murder in the Catacombs, the Second Daria Vinci Investigation.For Commissioner Daria Vinci, it was supposed to be a night off, attending a benefit concert for the Institute of America in Rome. But little did the wealthy, distinguished guests know that beneath their feet, in the ancient catacombs, a…