Yobs threw two stones at the window of a house in Tavern Walk, Corby.
Police are appealing for witnesses to the criminal damage caused at about 8.30am today (July 12).
A police spokesman said: “The offender or offenders threw two stones at the victim’s back bedroom window, causing it to crack.
“It is likely that the offender or offenders walked from Knights Court down the alleyway, at the side of the victim’s property, onto Tavern Walk.”
Anyone with information about the incident can call Northamptonshire Police on 101 or information can be given anonymously to Crimestoppers on 0800 555111.