“还是去衙门看看册子！”李牧忽然想到一种可能性，急需确认。
俩人回到衙门，找到流民册，从头翻看到末尾，果然没有萧皇后和杨正道的名字。因为每一个名字都是李思文亲手写上去的，所以他对每个名字都能对应上一个人。从头看了一遍，没有一个对不上号的，说明也不是报假名字的情况，这样一来便可以确定，萧皇后和杨正道真的没有登记过。
李牧确认了心中所想，把流民册合上，道：“没有登记，人还出现在了城里，说明除了城门之外，还有途径可以进城。而之前萧皇后和杨正道又没有在街道上出现过，那么就只有一种可能性了。那就是，城中另有密室，卫国公破定襄城的时候，萧皇后和杨正道就躲了进去，在里面躲了两个多月，直到我们发现他们的时候，许是没有粮食了，不得不从躲避的地方出来。”李牧越想越觉得可能，道：“有人知道他们住在哪么？”
李思文皱眉细想，忽然一拍脑门，道：“那个做饭婆子，她说过，她尾随杨正道，看到杨正道把窝头给萧皇后，她一定知道他们住在哪！”
“去找他！”
俩人又匆匆返回城墙旁，找了两个门，终于在南门找到了那个做饭婆子。细问之下，得知萧皇后和杨正道住在东坊靠北，距离北街的突厥贵族聚集地非常近。李思文回想了一下，之前唐军大营驻在这里的时候，萧皇后和杨正道住的地方，曾被用来安置伤兵。后来伤兵走了，就用来安置流民。他们肯定是在那时候从藏匿处出来的，负责安置流民的衙役看到房子里有人，以为是早安排的，就换了下一个，所以才会出现他们被算作流民，却在流民册上没登记名字的情况发生。
俩人带人来到做饭婆子所说的地方，里外看了一遍，没有看出什么异常。但李牧笃定这里有问题，道：“肯定有密室，找，挖地三尺的找，就算把房子拆了，也要找出来！”
众人应声，把手里的刀当做铲子，四处试探。李牧也和李思文也四处寻找，忽然听到一个青壮喊道：“这里有个地窖！”俩人忙跑过去，只见灶台边有一个打开了的地窖，入口是一块方形木板，已经被掀开放到了一边。地窖的入口仅能供一个人通过，李牧拿过旁边人的火把，直接钻了进去。
从入口进去，是一个约莫两米见方的空间，李牧四处照了一下，看到了不少烂菜叶，倒真相是一个储菜的地窖。但他不相信萧皇后和杨正道能在这么密闭的环境生活两个月，李牧抬手在地窖的墙壁上抚摸，忽然摸到了一块质地不同的地方。这地窖乃是砖石所砌，唯独这里，摸起来冰冰凉凉，倒像是铁。李牧把火把靠近，掸去灰土，发现是一个铁环。
李牧抓住铁环，试着拽了一下，没有拽动，他又试着拧，顺时针没动，再逆时针用力，这回铁环动了。
随着机括声响起，墙壁从中间裂开一道缝隙，李牧继续转动铁环，空隙越来越大，他的眼前竟然出现了一个密道！
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