the john and helen glessner family trust, supporting trustworthy journalism that informs and inspires. and by the frontline journalism fund, with major support from jon and jo ann hagler, and additional support from joseph azrack and abigail congdon. >> (translated): for many years, terrorism was something hypothetical, something that happened elsewhere. but at a certain point, you have to open your eyes. how did we not see this coming? >> narrator: in early 2015, belgian police, with the help of u.s. and french intelligence, were preparing to launch a raid on a terrorist cell thought to be on the verge of an attack. the suspects were hiding out in the town of verviers. (speaking french) >> (translated): they were clearly in contact with people who could have turned them in. but nobody did. these people were extremely careful, they never left the apartment. we knew we would face determined men. they had weapons, they had explosives. (gunfire) >> narrator: when belgian commandos stormed the hideout, they came under heavy fire. (shouting and gunfire) they shot two men dead and wounded a

the john and helen glessner family trust, supporting trustworthy journalism that informs and inspires. and by the frontline journalism fund, with major support from jon and jo ann hagler, and additional support from scott nathan and laura debonis. major funding for this program is provided by the kendeda fund. >> narrator: this is the story of three seemingly disconnected events beginning at the same time. what they each have in common is a type of infection that is becoming impossible to treat, a type of infection that has triggered deadly outbreaks, even at one of our most prestigious hospitals. it is a crisis that is spreading alarmingly fast, threatening everyone, even the healthy. (siren blaring) >> narrator: our first story starts in tuscon, arizona, in may 2011. >> when i think about that time, i think about spring... and just, you know, how busy it was and how beautiful she was. she was 11-and-a-half years old and just physically perfect, beautiful from head to toe, slim, you know, white-blond hair from being out in the sun. a little bit of freckles across her nose, bright blu

the john and helen glessner family trust, supporting trustworthy journalism that informs and inspires. and by the frontline journalism fund, with major support from jon and jo ann hagler, and additional support from chris and lisa kaneb. life on parole is provided by the w.k. kellogg foundation and the john d. and catherine t. macarthur foundation. (birds chirping) >> narrator: for a year and a half, we followed four people in connecticut as they left prison and were put on parole. >> i've been incarcerated for a little over eight-and-a-half years. the judge gave me ten years, i thought it was the end of the world, and here i am, ten days i'm going to be walking out the door. starting my life over. >> narrator: the state is trying to use parole as part of an effort to reduce its prison population. >> when i get out, you know, hopefully i get out of here and stay out of here. i've been here before, so it's easier said than done. >> narrator: it is now giving parole to more of its prisoners than ever before. >> what are you going to do differently to stay out? >> is abide by all the rul

the john and helen glessner family trust, supporting trustworthy journalism that informs and inspiresand by the frontline journalism fund, with major support from jon and jo ann hagler, and additional support from joseph azrack and abigail congdon. >> for more on this and other frontline programs, visit our website at pbs.org/frontline. frontline's "terror in europe" is available on dvd. to order, visit shoppbs.org, or call 1-800-play-pbs. frontline is also available for download on itunes. you're watching pbs -♪ if your strength is falling down ♪ ♪ i'll be right beside you now ♪ and i'll keep you warm -i'm charlie rose. -i'm judy woodruff. -i'm robert costa. -♪ yeah, i'll keep you warm ♪ i'll follow you into the storm ♪ ♪ oh, oh, oh ♪ oh, oh, oh ♪ anywhere that you go tonight on history detectives: four mysteries of the american west. roy, what chance do we have? i want to know if this belonged to kit carson himself. - if this saddle could talk. - man: oh, yeah. she did things women just didn't do. pulls out his pistol and pulls the trigger. elvis costello: ♪ watchin' the detectives