盐在门槛上

许知微到旧屋时，手机刚好显示十五点十分。

她在门外站了两分钟。蓝铁门上的油漆起了皮，门牌斜挂着，下面有一条白线。她以为是水泥，蹲下才看清：是盐。盐从门槛左边铺到右边，被夜里的潮气打湿，结成颗粒很粗的硬壳。

她没有跨过去。小时候祖母说过，门槛上有盐，说明家里有人没走远。

钥匙藏在右侧第三块松砖后面。三把，大的开铁门，中号开木门，小的没有标签。知微把小钥匙放进口袋，推门进去。

客厅没有变。藤椅靠在窗边，杯子倒扣在茶几上，祖母那件深蓝外套搭在椅背。空气里有樟脑丸、湿木头和鱼干的味道。她打开窗，隔壁的吴阿姨立刻探出头来。

“回来收东西？”

“嗯。”

“房子卖了好。”吴阿姨说，“人没了，屋子留着招潮。”

知微说：“还没决定。”

吴阿姨盯了她一眼，没再说话。

姨妈给她列过清单：房本、存折、药、首饰、旧照片。第一天下午，知微只找到两只碗。一只碗口缺了米粒大小的缺口，另一只碗底有朵掉色的牡丹。祖母总用它们吃饭。知微小时候问，家里明明有新碗，为什么不用。祖母说：“两只够。”

那时屋里只有祖母一个人。

第二天，她上阁楼找房本。阁楼很矮，屋顶的铁皮被太阳晒得发烫。最里面有一只木箱，锁孔正好能插进那把小钥匙。

箱子里放着七把钥匙。每把都拴着铝牌，铝牌上刻日期：七八年六月、八三年九月、八七年正月。最旧的一把已经弯了。钥匙下面压着一沓信，信封没有邮票，也没有地址，收信人只写“阿远”。

知微读了第一封。

“今天港口封了。你说过雾大时不要出海，我记得。”

第二封隔了五年。

“门锁换了。我把旧钥匙放在砖后。你要是回来，别骂我。”

第三封写在她小学毕业那年。祖母提到她，说知微长高了，不肯吃鱼，脾气像她爸爸。信最后只有一句：
“你别回来也行，告诉我一声。”

晚上九点，吴阿姨端来一锅汤。她看见桌上的信，碗差点滑下去。

“你翻这个干什么？”

“阿远是谁？”

吴阿姨把汤放下，先去关窗。她关得很用力，窗钩撞在木框上，响了一声。

“你奶奶的弟弟。”她说，“年轻时在港口做工。后来人没了。”

“失踪？”

“算是。”

“怎么没的？”

吴阿姨看着那串钥匙。“你奶奶说他上船。别人说他是自己走的。谁知道。”

“我爸知道吗？”

“你爸什么都不想知道。他十七岁就走了。”

知微想起父亲。他住在北方，很少接她电话，每年只在除夕发一句“新年好”。祖母住院时，他也没回来。她以前以为那是冷淡，现在忽然觉得，可能还有别的原因。

吴阿姨临走前说：“箱子里的东西别乱动。你奶奶留着，是她的事。”

“现在是我的事了。”知微说。

吴阿姨停在门口，没有回头。

第三天早晨，中介要来看房。知微从厨房擦到客厅，拖地时发现盐线一直延到碗柜后面。碗柜很重，她本来不想动。可盐在柜脚下断了，像有人把一条路掐断。

她找来撬棍，花了半小时才把柜子挪开。墙上有一扇小门，原先被柜子挡住。门漆成和墙一样的白色，边缘全是霉点。锁孔很小。

那把没有标签的钥匙插进去，转了一圈。

门后不是走廊。是一间不到两平方米的储物间。地上放着煤球、空酒瓶和一只旧行李箱。行李箱没有锁，里面是一件男式白衬衫、一张港口通行证，还有一盘磁带。通行证照片上的年轻男人眉眼和祖母很像。

知微拿着磁带去问吴阿姨。吴阿姨不肯接，只说家里没有录音机。

“你知道里面是什么。”

“我不知道。”

“那你为什么怕？”

吴阿姨的脸一下白了。她坐在矮墙后的小板凳上，过了很久才说：“阿远没上船。他那天夜里回来过。”

“回来过？”

“回来拿东西。你奶奶不让他走，他说不走就要连累全家。两个人吵得很凶。后来他从后门出去，天亮前就没影了。”

“为什么不报警？”

“报什么？那年谁都怕麻烦。”

知微听见远处有摩托车发动。吴阿姨低下头，手指抠着裙边的线头。

“你奶奶后来每年都给他写信，”她说，“她不是不知道他活着。她是不知道他还认不认这个家。”

中介来时，知微没有开门。

对方在门外打了三次电话，最后发来消息：下周还有别的客户。她看了一眼，没有回。下午，她去五金店买了新锁，又买了一罐蓝漆。

天黑前，她把旧柜子推回原位。储物间没有封死。她只是把门关上，把钥匙挂在厨房墙上的钉子上。盐被她扫进一个小碟，放回门槛左边。

第二天离开时，知微把铁门锁好。走到巷口，她才想起行李箱里的磁带还在包里。

五金店隔壁有家修家电的小铺，门口摆着一台灰色录音机，磁带舱的盖子半开着。老板坐在里面焊一只收音机。知微站了一会儿，没有进去。

她把磁带往包底按了按，继续往车站走。

有些声音，暂时不听也可以。门还在。钥匙也在。

· · ·

When Xu Zhiwei reaches the old house, her phone says 3:10.

She stands outside for two minutes. Paint has peeled from the blue iron gate; the number plate hangs crooked. Beneath it is a white line. At first she thinks it is cement. When she crouches she sees that it is salt, laid from one side of the threshold to the other and hardened into coarse grains by the night damp.

She does not step over it. Her grandmother used to say that salt on a threshold meant someone in the house had not gone far.

The keys are behind the third loose brick on the right: three of them. The large one opens the iron gate, the middle one the wooden door, and the small one has no label. Zhiwei puts the small key in her pocket and goes inside.

The sitting room has not changed. A cane chair faces the window; cups are turned upside down on the tea table; her grandmother’s dark-blue coat is draped over a chair. It smells of camphor, wet wood, and dried fish. When Zhiwei opens the window, Aunt Wu next door immediately leans out.

“Back to clear things out?”

“Yes.”

“Selling the house is best. No one left in it; an empty house only draws the tide.”

“I haven’t decided.”

Aunt Wu looks at her and says nothing more.

Her aunt gave her a list: deeds, bankbooks, medicine, jewellery, old photographs. On the first afternoon Zhiwei finds only two bowls. One has a chip the size of a grain of rice; the other a faded peony on its base. Her grandmother always ate from them. As a child Zhiwei had asked why, when the house had new bowls. “Two are enough,” her grandmother said.

Then there had been only her grandmother in the house.

On the second day Zhiwei climbs to the attic for the deeds. It is low under the hot iron roof. At the back is a wooden chest whose lock fits the unlabelled key.

Inside are seven keys. Each is tied to an aluminium tag stamped with a date: June 1978, September 1983, the first month of 1987. The oldest is bent. Under them lies a bundle of letters without stamps or addresses, each addressed only to A-Yuan.

The first says: The port is closed today. You said never to put to sea in fog. I remember.

The second, written five years later: I changed the lock. I left the old key behind the brick. If you come back, don’t scold me.

The third was written in the year Zhiwei finished primary school. Her grandmother writes that Zhiwei has grown taller, refuses fish, and has her father’s temper. The letter ends: You needn’t come back. Just let me know.

At nine that night Aunt Wu brings soup. Seeing the letters, she nearly drops the bowl.

“Why are you going through that?”

“Who is A-Yuan?”

Aunt Wu closes the window before she answers. “Your grandmother’s younger brother. He worked at the harbour. Then he was gone.”

“Missing?”

“More or less.”

She says the grandmother claimed he went aboard a boat; others said he left of his own accord. Zhiwei’s father, Aunt Wu adds, had never wanted to know. He left at seventeen.

On the third morning an estate agent is due. While mopping, Zhiwei sees that the salt line continues behind the cupboard. It ends under one heavy foot as though someone has pinched a road shut. With a crowbar she moves it and finds a small door painted the colour of the wall. The unlabelled key turns in its lock.

Behind it is a store room scarcely two square metres wide: coal, empty bottles, an old suitcase. In the suitcase are a man’s white shirt, a harbour pass, and a cassette tape. The young man in the photograph has her grandmother’s eyes.

Zhiwei takes the tape to Aunt Wu. Aunt Wu will not touch it. “There is no tape recorder here,” she says.

“You know what is on it.”

“I don’t.”

“Then why are you afraid?”

Aunt Wu goes pale. At last she says A-Yuan did not go aboard a boat. He came back that night to collect something. Her grandmother begged him not to go; he said staying would endanger the whole family. They fought, and he left by the back door before dawn.

“Why didn’t anyone report it?”

“Report what? In those years everyone was afraid of trouble.”

Her grandmother wrote every year afterward, Aunt Wu says. She was not unaware he was alive. She did not know whether he still counted this place as home.

When the agent arrives, Zhiwei does not open the gate. He calls three times, then sends a message about other clients next week. She does not reply. In the afternoon she buys a new lock and a tin of blue paint.

Before dark she pushes the cupboard back. She does not seal the store room; she only closes its door and hangs the key from a nail in the kitchen. She sweeps the salt into a small dish and puts it back at the left side of the threshold.

The next day, after locking the gate, she remembers the tape in her bag. At the mouth of the lane, beside the hardware shop, an appliance-repair stall has an old grey recorder at its door, the cassette lid half open. The owner sits inside soldering a radio. Zhiwei stands there for a while and does not go in.

She presses the tape deeper into her bag and walks towards the station. Some voices can wait. The door is still there. So are the keys.