Auckland police are concerned by a brazen and apparently planned attack in which a man broke into a house and tied up a young woman while her family slept upstairs.
The man stole the 19-year-old woman's laptop and jewellery at the Remuera home before leaving on a blue mountain bike early on Thursday.
He is described as between 30 and 50 years old, at least two metres tall and of slim, athletic build.
He was wearing green or brown cargo pants, a black hooded sweatshirt and a purple patterned bandana over his face.
Police want to hear of any sightings of a tall cyclist in the area that morning.