“Hey, Linda! Get ready for a houseguest,” said my sister as she nudged the suitcase into the hallway with her foot.

Lucy, hello! Welcome your guest, said the voice, as a battered suitcase rolled over the threshold, guided by a determined foot.

A late Saturday morning, just as Lucy had let her mind drift without intent, the doorbell echoed.

Twice. Then three more times. A long and unyielding ring after that.

Alex, fully fused to the telly, muttered absently,

Someones awfully keen.

There, on the doorstep, stood Nina: the younger sister. Clutching two humongous suitcases, a canvas holdall, and the sure-faced look of someone whos made a Big Life Decision and was impossibly pleased with herself.

Lucy, hello! Youre welcoming a guest, she declared, nudging the first suitcase expertly into the hallway. Like shed been training for this all her life.

Lucy instinctively stepped back. You dont joke about forty years of sisterhood. Your body learns before your mind.

How longs your stay? Lucy asked, eyeing the bulging second case with suspicion.

Nina shrugged off her jacket right onto the peg with Lucys own coat and surveyed the flat like a site manager inspecting her latest project.

Indefinitely, Luce. Im moving in. Big place youve got here: three bedrooms, two of you, ones clearly spare. I took it as a sign.

Lucy stared at her sister. Shed decided.

From the sitting room, Alex turned up the volume, letting the weather forecast muffle their words.

Nines, wait. Youre serious?

More than you can imagine, said Nina, ambling down the corridor, peeking in every room. This onell do. Lovely sunlight. Window onto the garden blissful peace.

It was the guest room: ancient sofa, sewing machine, and three boxes of never-sorted belongings.

Nina Lucy caught her at the door. Youve not even discussed this with us.

Whats there to discuss? Ninas brows disappeared into her fringe. Were family, Luce. And family shares. Mum always said so.

Lucy preferred not to think of mum just then.

The telly mumbled its forecast through the wall. Alex seemed to need every detail.

Nina was already unzipping her case.

She settled in with a thoroughness: shifting furniture, flinging open drawers, eying the room as if reclaiming lost property.

She moved the bed. Disliked its headboard near the window: Drafts, Luce, I simply cant my neck. The sewing machine was trundled to a corner: Why do you keep it here? You dont sew, do you? No? There, job done. Lucy watched the machines exile in silence.

By evening, Ninas slippers grand, fluffy, finished with lurid pompoms (the sort you spot at overheated market stalls) flanked Lucys demure shoes like a show bear guarding a librarian.

Alex ate dinner in a hush, eyes intent on his bowl, as if investigating the mystery of soup.

Good soup, he pronounced.

Soup as soup, Nina replied briskly. Alex, do you have a fan? My room is stifling.

Alex glanced from Nina to Lucy, then back again.

Ill see what I can find, he said.

Lucys sigh was so deep, her toes felt the ripple.

On the third day, Nina set upon the fridge.

Not just a peek. A proper reckoning, like an archaeologist on discovery.

Luce, this milks past it.

I know, didnt get round to binning it.

Three blocks of butter? Why, they clutter the shelf.

Nines, its my fridge.

Oh, but were not strangers.

Her catchphrase the skeleton key. Lucy heard it five times a day, always wondering if she should finally say, Not in this, Nines in this, you are a stranger. But never did.

Nina knew Alexs woodworking group timetable and Lucys serial drama hour. Shed appear in the ad break, mug of tea and endless chatter about life, vanished neighbours, the weather, the unruliness of youth, and, with special vigour, the state of politics.

Lucy nodded along, stole glances at the tellys soap opera heartbreak, thinking her own drama was rival to any on the screen.

Mornings, Nina outpaced them all.

Lucy always reckoned her sister a night owl turns out she was a lark with a personal schedule. By six, the kitchen rang out: clattering pans, hissing frying, Ninas voice bright as a May morning,

Alex, fancy eggs? Luce, with tomato or without? Found some cheese in your fridge a bit tough, grated it up all the same. Waste not, want not!

Alex would pad in, face the picture of resigned politeness. Hed eat the eggs and murmur, Thanks.

Lucy would stand in the doorway, dressing-gowned, watching this tableau.

Shes feeding my husband. In my home.

This, perhaps, was the morning a small gear slipped quietly into place inside Lucy.

She poured her coffee, sat by the window, and rang her daughter.

Sophie, are you free?

Free enough. Whats wrong?

Come over. We need a chat.

Sophie arrived on Sunday ahead of lunchtime, armed with cake. She set it on the table, hugged her mother, and whispered,

Tell me everything.

Lucy did every suitcase, the pompom slippers, the sewing machines exile, the rescued cheese, the eggs at dawn.

Sophie listened, only raising her eyebrows skyward when the tale called for it.

Mum. Is she paying you? For food, for the bills?

Says she will, for food.

Says or does?

After a pause:

Says.

Sophie glanced down the hallway at the guest rooms shut door.

At that moment, Nina emerged. Lit up at the sight of Sophie. One of those smiles only the truly unbothered muster.

Soph! Splendid youre here. Luce, wheres the sugar? The dish is empty.

In the cupboard, Lucy said.

May I?

You may.

Nina fetched it, spooned some into her coffee, tasted and nodded, self-satisfied.

Sophie fixed her with the composed assurance of one whod decided things long before the discussion.

Auntie Nina, gently when did you sell your flat?

A pause.

The telling kind.

How did you know? Nina lowered her mug.

Auntie May mentioned it. Casual chat, didnt mean to.

Nina looked at Lucy, who looked out the window.

Well, what of it? said Nina, voice creeping with that half-hurt, half-indignant tone of a caught-but-never-wrong person. The moneys in savings. Markets dodgy no point buying. Ill stay here a bit, save more, all sorted soon.

How long is a bit? Sophie asked.

A year, maybe two. Well see.

Lucy turned from the window.

Nines, you took your flats money and moved here to hoard it, didnt you?

Luce, dont be like that.

Am I right?

Were family, Nina said. Her strongest skeleton key.

But this time it rattled in the lock.

Sophie and her family are moving into that room. I invited them. Theyll be here by next Saturday.

Nina stared at Sophie. Sophie sipped her tea like someone with further secrets.

When did you Nina began.

I did, said Lucy.

It wasnt true. Sophie had her own place and every intention of staying there. But Lucys calm gaze was something new, and Nina felt it.

Nina said nothing at first. She got up, fixed her dressing gown.

Right, she said. Short and spare.

And went to her room.

Two days, Nina packed. No rush; just as methodical as when shed arrived. Plastic bags rustled, hangers rattled, the furniture was shunted back. Lucy kept away, and Alex did too.

By Wednesday morning, Nina appeared in the kitchen with both suitcases. She set them by the door.

Off to Maureens, she declared. Shes long since invited me.

All right, Lucy replied.

You should ring me sometimes.

Ill call.

Nina clutched her bag.

Luce, she said at the door, eyes ahead. Youve changed.

Lucy paused for a beat.

Yes, she agreed. I think I have.

The door closed.

Lucy stood in the hall, gazing at the empty hook where Ninas coat had hung. The floor was free of pompom slippers. The hallway felt wider than before.

She wandered to the guest room. Opened the window.

Then rolled the sewing machine back; set it under the light, where it had always lived.

That evening, Sophie called.

So, has she left?

She has.

How are you?

Lucy considered this.

Fine, she said. Honestly, really fine.

Twilight pressed at the glass, Alex clattered about in the kitchen, and the sound was familiar and oddly comforting: the old, good quiet of home.