Zero SumBy: John Gilstrap Series: A Jonathan Grave Thriller When a boy under Jonathan Graves protection dies of a drug overdose, the black ops veteran decides its time for a war on drugs that actually looks like a war. Jonathan Grave long ago lost faith with the so called war on drugs, a futile campaign that enables cartels to make billions under the protection of corrupt officials on both sides of the border. But when a twelve year old dies after consuming