A 27-year-old woman came out from a 20-minute shower at her home to find her laptop stolen on Friday morning, the police said.
She had left it unattended in the living room of her aunty's flat at Block 655, Yishun Avenue 4.
Although her mother and grandmother were in the house at the time, they neither heard nor saw the thief.
Both the gate and door had been unlocked at the flat.
The laptop cost $3000.
