Thieves pushed a hook through the letterbox of a house to fish keys out of a coat pocket and gain access.
The distressing burglary happened at a house in Chapel Allerton while the occupants slept.
Letterbox burglaries, where the criminals use a hook or other implement to remove house or car keys from a hallway, are becoming increasingly common, although the keys are usually taken from surfaces such as hall tables. Cat flaps can also be used to gain access.
The keys were then used to enter the house.