City of Bones / The shadow hunter chronicles 1

Clary Fray is seeing things nobody else seems to recognise. One day she witnesses a strange boy who kills somebody - but there remains no corpse! Distracted by a weird phone call of her mother she returns home just to realise that something terrible has happened. Her mother has dissapeared and a monster attacks the girl. This time she is saved by the strange boy and his friends. They are Shadowhunters... and Clary is one of them. How is that possible?