No man's land
(Book)

"Junior CIA field agent Kelly Kaiser jumps at the chance to lead a risky mission to Mexico to gather refugees from under the nose of the notorious drug lord who murdered her fiance. When the mission takes a revenge-fueled twist, Kelly finds herself facing dismissal, but Agnes Pendalon the CIA's chief 'spook' lady has other ideas. Kelly must lead a new, top-secret team to hunt down the people affected by a magical mysterious roman tree's supernatural powers, and stop its influence getting out of control. Facing an enemy she cannot see or define, Kelly is pulled into war between alien forces and humnanity, and soon discovers that there is more to her fiance's death than meets the eye."--,Provided by publisher.