Nearly a year after Li Zilong’s failed coup, Wang Zhi writes to his friends in the capital, asking for help. Assembling a team of friends and experts, Tang Fan answers the call. What they find on the border is not what they expected.

Surprisingly, Sui Zhou is the one who writes to him first. Less surprising is that Tang Fan gets involved too (they always did seem to come as a set). -- Wang Zhi, Sui Zhou, and Tang Fan do their best to express themselves via letters where verbally they couldn't.