The afternoon was drawing on, so Gaille began her search for Petitier's darkroom outside, taking advantage of what daylight remained; but the greenhouses and outbuildings all leaked far too much moisture and light, and she couldn't find any trace of photographic supplies.
Her ankle was throbbing badly from all the walking she'd done. She didn't want to exacerbate the injury, so she decided to give it a rest, maybe run the idea past Iain when he returned, see what he thought. But going back into the house, she caught a faint reprise of the vinegary smell she and Iain had both noticed that morning. Vinegar was used as a fixing agent in photographic dark-rooms, Gaille knew. Or acetic acid was, at least. Surely that meant the darkroom was somewhere in this house. She checked the kitchen and larder for vinegar, just in case, then went room by room, searching cavities and closets, pulling books from the shelves to look behind them, tapping the walls for hidden spaces. Nothing. Her puzzlement grew. She stood in the middle of the main room with her hands on her hips and stared around her.
Her ankle was still throbbing. She sighed and sat down in the armchair. It was only then that she took proper notice of the rugs thrown negligently around, particularly the largest of them, the one beneath her feet, with its flamboyant if faded motif of Theseus and Ariadne standing at either end of a fiendish labyrinth, and the golden thread that connected them through it.