Police have warned householders to be vigilant after bogus workmen stole cash from an elderly couple's Falkirk home.
A man visited the couple's house on East Bridge Street and said he needed to check their water supply.
As he distracted them, his accomplice searched the house and stole a three-figure sum of money.
Police said they wanted to trace a man aged about 26 and about 5ft 6in tall. He had a medium build and was pale skinned with fair short hair.
He was clean shaven and was wearing a dark woollen tammy hat and a dark, waist-length anorak.
A spokeswoman for Central Scotland Police said the couple had not checked for identification when the man knocked on the door at about 1530 GMT on 29 January.
"East Bridge Street may have been busy with people walking to or from the town centre and somebody may have seen something suspicious," the spokeswoman said.
"We urge householders to be vigilant when answering their door to people they do not know and to always check for ID. Do not let anybody into your house if you are unsure of who the person is.
The force has recommended that householders sign up for the password schemes run by many utility companies - and to call police if the callers do not have identification.