Only the ace of spaces with 〜だけ
The Detective Boys group visit a cabin where Professor Agasa has secretly set out clues leading to a treasure. Conan draws the group’s attention to an arrow pointing to a table, on top of which there is…
- "A pile of cards, rather unnaturally scattered about."
- "Further, for some reason, only the ace of spades is pinned down with thumbtacks..."
だけ limits the subject pinned down by thumbtacks to 「スペードのＡ」.