A 43-year-old man is undergoing emergency surgery following a stabbing on Brisbane's northside this morning.
Police have alleged the man was sitting on the second-storey balcony of a home in Grange when he was stabbed in the chest by a 44-year-old woman.
Superintendent Andrew Massingham alleged the woman left the man on the balcony and locked the door before setting fire to a number of items in the home and barricading herself in the bathroom.