Police are searching for a woman who is believed to have posed as a social worker to gain entry to a house in Liskeard.
Once inside the property, the woman is thought to have stolen a key.
Police have released an image of a woman they would like to speak to in connection with the burglary, which took place between 2.30pm and 5.30pm on Friday December 6.
A representative from Devon and Cornwall Police said: “A woman gained entry to the property by informing the resident that she was a social worker, but when challenged later quickly left.
“The victim later discovered that her back door key had been taken.”
The suspect is described as white, about 5’7” tall and between 30 to 35-years-old.
She is of slim build, wore black jeans, a cream top and a smart black jacket.
She also has a distinctive tattoo of a heart on the back of her right hand just above the small finger.
Anyone with any information or who recognises the woman pictured should call police on 101 quoting reference BD/13/1578.
Liskeard police is reminding people that they should always request formal identification from any visitors to their property.