The scene
Promenade Bookshop · Voucher distributionThe club’s voucher was used without permission for a personal purchase. Three collaborators collected books that afternoon; the receipt has lost its name.
The voucher subtracted a fixed amount and then applied another discount. The original prices identify the purchase.
What we know for certain
One of these people used the voucher on their own purchase. They added no products and combined no discounts. The operations were applied in exactly the stated order. There were no shipping costs, additional taxes or rounding.
The three accounts
Lara Puig
Reader«My books cost twenty-six euros.»
Mauro Font
Guest bookseller«My reservation was worth thirty euros.»
Nerea Costa
Translator«I had reserved thirty-six euros’ worth of books.»
Examine the evidence
0 of 5 openedOpening these five clues does not cost points.
01The first reduction
The voucher first subtracts six euros from the original purchase price. This reduction is never applied at the end.
02The later discount
It then halves the remaining amount. It does not halve the original price.
03The nameless receipt
The total charged was exactly fifteen euros. The receipt confirms that the club’s voucher was used.
04The reservations
The register verifies the original prices: Lara 26 euros, Mauro 30 and Nerea 36. All three collected exactly what they had reserved.
05One recorded use
The voucher was redeemed only once, by the person whose purchase benefited. It was not split across several purchases.