The Vitamin D Deficiency

Marcus stood in the kitchen, chopping spinach with unnecessary force. The green leaves scattered across the cutting board like torn pieces of paper. Behind him, Elena moved through the apartment with the practiced grace of someone who had nothing to hide—which was exactly what made everything so suspicious.

"You're playing padel again tomorrow?" he asked, not turning around.

"Yes, Marcus. We've been over this. Tuesdays and Thursdays."

He heard her bedroom door close, the soft click settling like a period at the end of a sentence they'd been repeating for months. Marcus dropped the knife and gripped the counter's edge. Three times a week, she came home smelling of expensive shampoo and nothing else—no sweat, no exhaustion, no trace of the three-hour matches she supposedly played.

The vitamin bottle caught his eye. Elena had started taking a new supplement last month. Vitamin D, she'd said. But the dosage she took was excessive, the sort prescribed to people who worked nights, who rarely saw the sun. Who lived in shadows.

He crossed to the window, where an orange light filtered through the blinds. Sunset. She should have been on the court now, in the middle of a match. Instead, her phone lay on the counter, silent.

Marcus had never considered himself paranoid. But six months ago, he'd noticed her encrypted messages. Three months ago, a man had followed him home from the grocery store. And now this morning, he'd found something in her coat pocket that made everything click into place: a business card for a private intelligence firm, handwritten with a name that wasn't hers.

They had never met the woman he thought he married.

The front door opened. Elena stepped inside, carrying her racket bag. She froze when she saw him standing by the window, the orange sunset illuminating his face.

"You're early," she said quietly.

"I didn't go to work today."

He held up the business card. Her expression didn't change—but he saw it, the microsecond where the spy slipped, where Elena flickered and something colder surfaced.

"We need to talk," she said, setting down her bag.

"No," Marcus replied. "You need to tell me who you are."

She looked at him for a long moment, then: "That's complicated."

"Try me."

The spinach lay forgotten on the cutting board as the sun disappeared, leaving them in half-light, strangers in the home they'd built together.