A woman called Isabel pushes a little girl to send videos from her hospital bed. It’s part of a recruitment drive for sick children in Colombia to take part in campaigns. What does she know about the hundreds of thousands of dollars that appear to have been raised? It’s money the family never saw. Who was she working for, and what can she tell us about this scam?

Season 10 of World of Secrets, The Child Cancer Scam, is a BBC Eye investigation for the BBC World Service.

Please note, the image is being used for illustrative purposes only and the child depicted is a model.