. >> wendy: and i'm wen giv wendy griffith.or years, the abu saif terrorized the southern philippines. they shocked the world in 2002 by kidnapping american missionaries, martin and grace. today they're still at work, but are they as dangerous as they once were? i went back to basil island to find out. it is one of the most beautiful places on earth, and in many ways, untouched by time and progress. but for nearly three decades, a deadly enemy has preyed on the people living in the southern philippines. the enemy, ab siaf, which stands for father of the sword. its goal: make the southern islands an islamic stronghold. beheadings are their signature. they carried it out against guillermo simply because his ransom did not come on time. in 2002, terrorists assigned this man the chilling task of collecting this man's bones. >> if you don't pay taxes, they will kill you. they're very angry with people, especially the foreign tourists. here the christians and the muslims live together. >> reporter: amil, a government spy, also witnes