Louise Andrew and her family were clearing out the loft when a couple of items caught their eye.
Two framed pictures of a Glasgow policeman from the beginning of the last century were tucked away in a corner.
One showed the man in profile wearing his uniform, the second was a family group.
Now staff at the Glasgow Police Museum are using their detective skills to try to discover the man's identity.
Louise, 42, said she and her husband Brian Ponsonby moved into the house in Woodstock Avenue, Shawlands, three years ago.
She added: "We had decided to clear out the attic for some building work.
There was just a lot of junk up there left by the previous owners, nothing else of interest.
"It was Brian who handed the picture down to me. When I saw it I was immediately interested and wanted to find out more.
"The pictures were covered in dust and surrounded by a lot of junk from the 1970s -stereos, speakers, that sort of thing.
Louise, a journalist, said two of her children, six-year-old Rebecca and four-year-old Christina, took the photographs to the Police Museum in Bell Street and handed them over to curator Alastair Dinsmor.
They were accompanied by Louise and Brian, and the couple's other daughter, 19-month-old Charlotte.
Louise said: "He identified it as a Glasgow police lieutenant's uniform, apparently the crest on the hat gives it away."
The museum will now put the photos on display and try to discover who the man was.
She said: "They have been framed nicely, so they probably once took pride of place in someone's home. I'm really pleased that the pictures will now be put back on show, instead of being left discarded in a dusty loft."
Mr Dinsmor, the Museum chairman and a retired Strathclyde Police inspector, said: "We would like to identify him, that's the main thing.
"He was a lieutenant in the City of Glasgow Police, that's the equivalent of a chief inspector nowadays.
"The first lieutenants were in 1819 but looking at hs uniform it's between 1912 and 1927. The coat is quite elaborate, it looks like the number two dress of the Scots Guards when they went about with a long black coat.
"There were three lieutenants for every division and there were about 12 divisions, plus there were some at headquarters and some doing other jobs. So maybe about 40 or more at any one time.
"I think the main photo is a retiral picture, the other one looks like he has four sons and a number of grandchildren.
"I'll do some of my own research, but I also hope someone who sees this picture might know who he is.
"The photos are interesting in themselves, but what we really want is to unlock the stories behind them."
Mr Dinsmor said his search would start at the address where the pictures were found and where he hoped he would be able to track down former residents.
He said the Museum, run by volunteer members of the Glasgow Police Heritage Society, is given a lot of old photographs and other items, although mostly from the families of the officers in question.
Anyone with information about the mystery officer discovered in Shawlands is asked to call the Museum on 0141 552 1818.