Hi, I only just joined Mumsnet today because my teenage daughters behaviour is making me ill. We've had several instances when she has just stormed out of the house late at night and we don't know where she is - and usually for pretty much no reason. This happened Boxing Day when we were at her grandparents. She refuses to answer the phone and said she was staying at a friends house overnight but refused to say where. Of course we didn't know if this is true - she's 14 and therefore vulnerable but when we say we will call the police she holds us to ransom and says she will never come home if we do this. So many friends say, do this and do that - but ultimately even the calmest of showdowns over behaviour result in her storming out of the house. Aside from physically restraining her we have no way we can stop her doing it. Quite often these outbursts seem to come out of the blue. I don't know where to turn. Clearly we need to address this behaviour but everytime things calm down we are glad of this and try to avoid anything that will lead to another outburst. Safety is the big issue. We can't have her running off at stupid o'clock and risk something happening to her. Any advice would be so welcome or if anyone has been through anything similar? We lost a family member a few months ago and I have had it suggested that when this happens to teens they can question their own health/mortality and others too, making them act out.