'There are as many pathways to homelessness as there are homeless people in the world. For some, it’s a sudden freefall triggered by a lost job, a broken home life or some other seismic personal upheaval. For others the road to sleeping rough winds down a slow, steady and depressing gradient until it arrives – quite literally – at rock bottom. Tragically, some are even born into it. Many have mental illness to contend with.' (Introduction)