Ianto decides the most logical place to begin his search is the tumble drier, but feeling around inside fails to reveal the missing sock. Ditto for the washing machine, and there’s nowhere the sock could have been dropped en route from one to the other since they’re standing side by side. Just to be sure, he scans the utility room floor, but it's clear.
No stray sock.
His next thought is that maybe it’s still lurking in the laundry hamper, but on checking, the only socks there are the last pair he took off.
The missing sock is proving elusive.
TBC in ‘The Loneliness Of A Single Sock’