When I returned from my work trip to Valencia, the apartment in Carabanchel was strangely silent. I dragged my suitcase down the hallway when I noticed a piece of paper taped to the entry cabinet. It was my husband Javier’s tight handwriting, but I also recognized the tone of his mother, Pilar: “TAKE CARE OF THIS SENILE OLD WOMAN.”

No signature. No explanation. Just that sentence, written in blue ink and underlined several times, as if each stroke were a stab. I felt a surge of anger—and something close to shame.

“Grandma Dolores?” I called, raising my voice.

Nothing. The TV was off, the kitchen half-tidied, a glass with traces of milk on the counter. A damp smell drifted from the end of the hallway, from the small room Javier always called “grandma’s little closet.”

I pushed the door open.

Dolores was lying in bed, half propped up on flattened pillows. The sheet was stained, her nightgown clinging to her body. Her skin looked grayish, her lips dry, her eyes open—far too aware for someone they had reduced to a “senile old woman.” A wet rasp shook her chest with every breath.

“God…” I whispered. “Dolores, it’s Lucía. I’m back, okay?”

She blinked with effort and moved her trembling hand, searching for mine. I sat on the edge of the mattress and took it. The smell of urine and cheap medication hit me. I couldn’t help wondering how long they had left her like this.

“Help me…” she whispered, barely a thread of sound. I leaned closer.

“Help me get my revenge.”

I froze.

“What are you saying, Dolores?”

Her eyes locked onto mine with a sharpness that unsettled me.

“They have no idea who I really am,” she murmured, almost proudly. “But you’re about to find out.”

A chill ran down my spine. Since I married Javier, the official version about her had always been simple: an old woman with dementia living off a tiny pension, a burden. But that look didn’t belong to a lost mind.

“In the dresser… bottom drawer…” Each word seemed to cost her breath. “The green envelope. Take it. It’s for you.”

I glanced at the old wooden dresser across from the bed. Its varnish was chipped, a crucifix hanging above it. I hesitated.

“First I’m calling an ambulance, Dolores. You’re very sick.”

Her fingers tightened around my wrist with surprising strength.

“First… the envelope,” she insisted. “Then do whatever you want.”

I swallowed, stood up, and opened the bottom drawer. It was full of neatly folded sheets. At the very back, almost pressed against the wood, I saw a dark green envelope with no sender. My name was written across it in firm letters:

“LUCÍA MARTÍN GARCÍA.”

I picked it up carefully. It was heavy. My heart pounded in my ears.

“Open it,” she whispered.

I tore the edge open. Inside was a thick stack of photocopies, several original documents with notary stamps, and a small black USB drive clipped together.

The first page read in capital letters:

“FOR WHEN I DECIDE TO COLLECT WHAT THEY OWE ME.”

continue to the next page.”