Drug-related deaths have soared in New Hampshire, where an influx of cheap heroin has claimed victims from every section of society. The state is facing an epidemic of addiction and overdoses.

Voters in the state, which holds the first-in-the-nation presidential primary in February, say drugs are now their biggest concern.

In the first of a two-part series, the BBC's Franz Strasser explores the origins of the epidemic and the devastating impact it's having on families and communities. He talks to a family who lost their daughter to heroin and former addicts who started a sober living community.

Watch part two: 'I can lock addicts up but they'll be back'