Border Post Courier

Lu Yuan, a lowly courier at a border post, sends out a military order by protocol, but that very night officials seal his home, and his family is accused of treason. If the true Western Dispatch Order, which should have been sent to West Fort, is not recovered within seven days, his entire family will be executed. Lu Yuan knows only the rules of the post road, seals, and the ledger of favors, yet he must follow the cracked seal, the lost horse, the half courier token in a dead man's hand, and the grain carts that left early through the pass to find out who intercepted the true order and who sent a fake Eastern Dispatch Order to the Northern Court. With each clue he uncovers, he gets closer to the spy within the border army's grain supply line. — Description from novelcodex.org