A woman came to me and said, “I’m engaged to the lady’s son, but he vanished two weeks ago.”

I flung open the front door and there, trembling on the doorstep, was a tearstreaked young woman in a crumpled coat, her hands shaking like a leaf in a gale. Good morning Im the fiancée of your son, she sniffed. But hes vanished. Two weeks ago. And nobody knows where hes gone.

I froze. I stared at her, trying to slot the pieces together in my head. A fiancée? My son, Mark, had never mentioned being engaged. Hed never even spoken of anyone he was headoverheels for. And disappearing? Hed been at the shop just a week earlier, helping me haul home the groceries, sipping tea and complaining about how swamped he was at work. Swamped, as usual.

I ushered her in. She perched on the edge of the armchair and fished a photograph out of her handbag. It showed her and my sonMarkstanding handinhand by a lake, grinning like fools. It was in August. He proposed then, she whispered. Since then weve planned everything together. We booked a flat, were due to start a new job in Scotland next week, and were supposed to move out in seven days.

My anxiety grew with each word. In my world there were no proposals, no Scotland moves, no grand plans. Mark lived alone in a flat in York, working remotely for some tech startup. He kept his secrets, sure, but he never vanished. He never left me hanging.

She told me shed called his flatmate, the woman continued. He said Mark had packed up and left, but he didnt say where. He wont answer my calls. Nobody does. Thats why I came to youmaybe hes still around? Maybe somethings happened?

I rang Mark. The line was silent. I texted a single word: Where? No reply. And then something in me cracked; I felt a mothers terrorthe kind that only comes when you realize you dont really know your own child. That something had slipped past my eyes for years, and Id pretended not to see it.

I started searching. Over the next few days I rang his friends, former schoolmates, even his exgirlfriend from a decade ago. Everyone echoed the same: Marks been different lately. Quiet. On edge. Like somethings after him.

At last a message arrived from an unknown number. One line: Dont look for me. I have to fix this. Nothing more. The police shruggedit was an adult, hed made his own choices. No missingperson report, no leads. Just me, the bewildered womanLucy, as she introduced herselfand a yawning void full of questions.

One afternoon a stranger knocked on the door. He claimed to know my son. Mark got mixed up in something youd rather not discuss over the phone, he said. He didnt run from us; he ran from what hed done.

A week later a handwritten letter arrived. It was long, inkstained, and entirely Marks. He confessed hed fallen into debt, running a side hustle nobody knew about, and that hed tried to dig himself out by taking on more liabilities. He didnt want to drag us into the mire hed created.

I know what Im doing is cowardly, he wrote, but maybe if I disappear, no one will have to suffer.

Tears blurted down my cheeks as I read his words. Shame washed over me, tooyears of never asking, of assuming he was fine because he never asked for help. He was drowning, and Id been watching from the shore.

Lucy said shed wait. She loved him and believed hed return. I wasnt so sure what to believe. All I knew was that since that day nothing has seemed as clear as a cloudless skynot even the feeling you get when you look a child straight in the eyes and think you know them completely.

Sometimes even your own son can become a stranger. And youre left with the question nobody ever dared to ask out loud: who on earth is he really?