In 2010, Guatemala, where 20 percent of the population lives on less than $1 a day, got $40 million worth of free medicine and medical supplies.
It didn't come from the Red Cross or UNICEF or any other major international relief agency.
Instead, the donations came from 15 little-known U.S. charities, most of which have nothing to do with foreign aid.
Despite the substantial size of the donations, the Internal Revenue Service doesn't require charities to publicly disclose details about the shipments.
And no one — including the U.S. charities and the biggest recipient in Guatemala — was willing to be specific about where the medical supplies went or exactly who benefited.
Using these shipments as the focus, the Tampa Bay Times, The Center for Investigative Reporting and CNN tried to do something state regulators and the IRS rarely do — verify what charities actually send to the needy overseas.
The Times laid out its story on Jan. 26. You can find that link here.
Tonight at 8, CNN will air the second part of its report on Anderson Cooper's AC360. Watch as CNN reporters travel to Guatemala to try to track down where the money went.