The Mirrors — Sara M. Barton

Alpha Orionis Enterprises created a highly classified software program called the Bellatrix Project for the United States government. Unbeknownst to the company, Russian GRU officers in a cyber warfare unit called Betelgeuse penetrated the classified system....But the dangerous cyber hacking begins to fall apart when two ex-lovers are thrown together in Grenada by someone who knows about their private trysts. They can't trust each other with the truth about the secret lives they live. But someone knows what those secret lives entail. That someone needs them to take the fall to cover up a Russian GRU-led espionage plot.As the body count goes up, Suzanne Handley and Brice Burns must work fast to unravel the lies and uncover the truth about a secret network of Russian mirror agents deployed to impersonate American intelligence personnel. It's an uneasy alliance that could get them killed, but if they do nothing, those Russian spies will get away with a deadly cyber hacking that will imperil every CIA officer and destroy CIA operations around the world. Once those spies are inside the highly classified Bellatrix communications system being developed, Moscow can launch the new Cold War from the safety of Red Square.