There are 2 books in the Falcon Mercenary Group series. The newest book is Into the Lair which came out in 2009.

1
Into the Mist

Book cover of Into the Mist
One woman's mission to bring down a sexy elemental shifter turns into a battle of wills.and hearts. Falcon Mercenary Group, Book 1 Hostage recovery specialist Eli Chance has a secret. He was born a shifter. A freak of nature. While on a mission, Eli's men and their mercenary guide are…
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2
Into the Lair

Book cover of Into the Lair
Falcon Mercenary Group Book 2 It was supposed to be an easy mission. But nobody told her that. Ian and Braden Thomas return to the U.S. to extract Katie Buchanan, the sister of the teammate who betrayed them. She could very well be the key to taking down the man…