For fans of The Border and Jason Bourne, The Concern is an explosive action thriller about a DEA agent sucked into a dangerous turf war on the US-Mexico border. It's hard to make Diane Harbaugh flinch. A former prosecutor notorious for her aggressive tactics, she's now a DEA agent who interrogates witnesses so effectively, she has them confessing in tears. But when she hears from Gustavo, a high-ranking cartel member with an invaluable secret about the international black market, she's thrown for a loop. She heads to Mexico to meet him, and her entire understanding of justice and duty is thrown into question. Gustavo sends her down a rabbit hole that leads to a criminal conspiracy more pervasive than anything she and the DEA ever suspected. She teams up with Ian Carver, a disillusioned CIA agent, and begins to unravel layers of deceptions, grifts, and schemes that date back to the beginnings of the Afghanistan War. As they learn more, they become...