T. Davis Bunn

"Junior CIA field agent Kelly Kaiser jumps at the chance to lead a risky mission to enter Mexico and gather refugees from under the nose of the notorious drug lord who murdered her fiancé. When the mission takes a revenge-fuelled 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 everyone infected by a magical, mysterious rowan tree's...