Hope this still is on site.
Female soldier becomes disillusioned, retires and enters nunnery as a postulant. Is teamed with a boy whose father, unbeknownst to anyone, altered his genetic makeup in a manner that gave him psychic powers. The father had died right when the boy was born, and left instructions to place him at this particular orphanage.
US Government finds out about the boy's powers, and the chase is on.