We track four people on their journey.
Caught in the crossfire of the US war on gangs
Steff Gaulter | 17 Oct 2012 08:55 GMT
This is the time of year when the trees of the northern hemisphere give a particularly eye-catching display.
Just before the leaves fall from the trees, they give a final show of vibrance.
Across many parts of the northern hemisphere, the leaves are turning brilliant shades of reds and golds.
These stunning colours are shining in Sheffield Park Garden, East Sussex, southern England.
Every autumn as the days get shorter, the leaves begin to die and the pigment that gave the leaf its green colour, the chlorophyll, disappears.
Not all leaves change colour, and the vivid green of the evergreen plants adds to the variety of colours.
The russets of the autumn leaves was present throughout the summer, but was masked by the vivid green of the chlorophyll.
The brilliant display happens every Autumn as days become shorter.
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