Gadgets, drug mules and a French accent: my life as a private investigator

How do you stumble into the life of a PI? Think you'd be cut out for it? From lost teddy bears to hand-delivered divorce papers, the work of a private investigator is as varied as it is secretive. Emmanuelle Welch, a former journalist turned private investigator, speaks to J Oliver Conroy of the Guardian about her experience as a P.I. in the age of social media.