There are 3 books in the The Fifth Column series. The newest book is The Phoenix Variant which came out in 2014.

1
The Chimera Vector

Book cover of The Chimera Vector

"Packed with intense fight scenes and dizzying twists and turns, this is an adrenaline-pumping introduction to Farrugia's explosive new series.” - Thriller of the Year, Apple Books

Damien and Jay don’t exist. Officially.

Unofficially, they’re genetically engineered operatives with an impossible mission. One of their agency’s best operatives has gone…

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3
The Phoenix Variant

Book cover of The Phoenix Variant
Sophia: former black operative, current enemy of the state.

Moments before a catastrophic hurricane hits New York City, a terrorist attack vaporizes a museum and a large chunk of the Upper West Side. Almost caught in the explosion, Sophia gives chase to a suspicious figure running from the blast zone.…