Wren was a small orange tabby with sharp eyes and a silver bottlecap she kept on the second shelf, between the pepper grinder and a chipped blue mug. When something needed investigating, the bottlecap went on her head, tilted just so. Tonight, something needed investigating. The hum had started after supper. Not the fridge hum — she knew that one, low and steady behind the cold white door. Not the pipe hum — that came from the wall and smelled of rust. This hum moved. Closer, then farther, then closer again. Wren's ears swivelled forward like two small satellite dishes.
She dropped from the counter without a sound. Four paws on the cool tile floor. Bottlecap on. The hum was somewhere below, somewhere ahead — she could feel it faintly through the pads of her feet, like a tiny train moving under the house. *Closer, then farther. Closer, then farther.*
She followed it under the kitchen table. The chair legs made a little forest in the dark, and between them — flower petals. Pink ones, scattered in a wobbly trail, the same pink as the roses in the vase by the hallway door. Something had bumped that vase. Something had been moving through here already. Wren pressed her nose to a petal. Faintly sweet. Faintly dusty. She filed this information away and kept going.
Behind the recycling bin, the hum was louder. She squeezed past the cold metal edge and found the trail of petals leading into the hallway — and there it was. A round, flat machine, blinking one small red eye in the dark, trundling across the tiles all by itself. It bumped the skirting board. It turned. It trundled back. *Closer, then farther. Closer, then farther.* Mystery: not yet closed. Wren followed it into the sitting room, stepping carefully over the rug's fringe. And that was when she saw him. Biscuit the hamster. Perched on top of the round machine, his tiny top hat knocked sideways, his four paws splayed wide, going around and around in slow, helpless circles. He had a look on his face that said: *I have made a terrible mistake and I cannot get off.*
Wren sat for exactly one second. Then she stepped onto the machine beside him. It rocked slightly. Biscuit made a small, strangled squeak. The machine kept trundling, bumping against the leg of the armchair, spinning left, spinning right. Wren lowered her nose. She sniffed the edge, the seam, the small rubber button near the front — she pressed it, firmly, with the flat of her nose. The hum stopped. The machine went still. The little red eye blinked once, then went dark. In the sudden quiet, Wren could hear the kitchen clock ticking all the way from the other room.
Biscuit stood very still for a moment. Then he wobbled off onto the rug, sat down hard, and straightened his top hat with both paws. He looked at Wren. Wren looked at him. She blinked at him — long and slow, one deliberate blink. He scurried back to his cage without another word. Wren stepped off the machine. She carried the bottlecap back to the kitchen in her teeth, set it on the second shelf between the pepper grinder and the chipped blue mug, and circled the rug twice. She settled. Paws tucked under her chest, chin down, eyes closed to a thin copper line. The kitchen clock ticked. The fridge hummed its steady, known hum. The flower petals lay where they had fallen, pink and still across the dark tile floor. Mystery: closed.
