Here's some more information on the background of this case, how it came about and became known as Operation Sunflower:
"Operation Sunflower is named after the first case conducted one year ago under the agency's newly created Victim Identification Program. Operation Sunflower commemorates the one-year anniversary of this first successful rescue under the new program.
"The Sunflower case began in November 2011 when Danish law enforcement officials shared with HSI their discovery of material and posts on a chat board indicating that a 16-year-old boy was planning to rape an 11-year-old girl. The suspect was soliciting advice on a pedophile board and posting images of the girl.
"One image held a clue that proved to be invaluable to investigators: a yellow road sign visible from the window of a moving vehicle. The road sign depicted a sunflower graphic that was unique to the State of Kansas.
"For days, HSI special agents drove in pairs along Kansas highways, seeking a comparison between the images in the photos and the actual locations. Just 13 days after receiving the material, and by combining sophisticated photo forensics with traditional law enforcement methods, special agents located the residence in a small Kansas town. These efforts made it possible for law enforcement to intervene and rescue the girl before she was further victimized."