It's an 80-year-old mystery that is proving hard to solve.
Navan Library in Co Meath has become the centre of a 'whodunnit' puzzle after a library book -- loaned out in December 1932 -- turned up in pristine condition last weekend.
Ciaran Mangan (46), a librarian at Navan Library for the past 12 years, found the photographic book after conducting his usual checks around the library before opening time on Monday morning.
"It was like any other day really. I arrived in at 9am and as usual there were returned books lying on the hallway that had been dropped in over the weekend. I then went to the side entrance to collect the post and that's when I discovered it: 'The pictorial record of the 31st International Eucharistic Congress, Dublin 1932'.
"It is a photographic history of the last time the congress was held in the capital city," Ciaran told the Irish Independent yesterday.
"It was due to be returned in December 1932. We know the book was published in the same year just after the congress. There were a number of publications brought out marking the event and this is the Veritas publication.
" The Irish Independent had its own commemorative publication for the congress. With the congress coming up, we've decided to put it on display in this branch. But safe to say we won't be lending it out to anyone again!"