There are 2 books in the Red Widow series. The newest book is Red London which came out in 2023.

1
Red Widow

Book cover of Red Widow
“A wicked sharp spy novel…Equal parts Tinker Tailor Soldier Spy and Killing Eve.” –S. A. Cosby, author of Blacktop Wasteland and Razorblade Tears

An exhilarating spy thriller written by an intelligence veteran about two women CIA agents whose paths become intertwined around a threat to the Russia Division--one that's coming…
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2
Red London

Book cover of Red London
CIA agent Lyndsey Duncan's newest asset might just be her long-needed confidante...or her greatest betrayal.

After her role in taking down a well-placed mole inside the CIA, Agent Lyndsey Duncan arrives in London fully focused on her newest Russian asset, deadly war criminal Dmitri Tarasenko. That is until her MI6…