The Secret Key and the Hidden Apartment

FOUND A SECOND KEY TO A HOUSE I DIDN’T KNOW HE OWNED INSIDE HIS BRIEFCASE
My fingers closed around the cold metal key hidden beneath the lining of his old leather briefcase. It wasn’t any key I recognized from our home, our cars, or his office building from the spares I kept. A small address tag was attached, listing a street name downtown in a neighborhood I’d never once heard him mention over twelve years together.
My heart started pounding, a frantic, sickening drum against my ribs, making it hard to breathe around the sudden tightness in my chest. He walked in then, still humming off-key from his commute, dropping his jacket onto the worn armchair near the door, oblivious. “What’s that?” he asked casually, his voice a little too light, a little too smooth as he glanced over.
“What is this key for, Mark?” I asked, holding it out, trying desperately to keep my hand from visibly shaking as the room seemed to spin. He stared at the object, his eyes flicking up to mine for a split second, his practiced smile fading instantly into something hard and defensive I’d never seen before. “Why are you digging through my things?” he snapped, his voice sharp, making the temperature in the room suddenly drop several degrees.
“Because I found *this*,” I shot back, pushing the small piece of metal into his unresisting hand, the silence stretching thick and suffocating. “An ‘old rental’ doesn’t have a tag dated last week with a locksmith’s number on the back, Mark.” His face went completely white, utterly drained of color, his jaw clenching tight as he looked away again.
Then my phone lit up – a message: “They’re waiting for you at the new place.”
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