I Put a Spell on You I Put a Spell on You is a in " " . Description . Camp McCarran has been compromised , and an agent is feeding information to Caesar ' s Legion about NCR troop movements . Find out who this agent is . Detailed walkthrough ( NCR ) . At some point , or upon asking James Hsu about problems at Camp McCarran , you will be asked to speak with Captain Ronald Curtis , who is located on the ground floor of the Camp McCarran terminal building to the west of the escalators . He will then ask you to speak to Carrie Boyd or Contreras ( Although he says that Contreras isn ' t " above " suspicion ) . Map markers will send you to Captain Sterling , Contreras , and Boyd to ask around about suspicious activity . Contreras will refer you to Boyd but Sterling will give you valuable information about the spy . Speaking to Boyd will complete this part of the quest . Ask her about break - ins . She will say that there have been break - ins at the control tower every night . Ask her for an access key . IMPORTANT : Do not inform Curtis about that lead if you want to save the monorail . If you do so , he will still go to the tower but he will not talk on the radio , and your character will have no way of knowing his plans to destroy the monorail until you speak to Hsu after confronting Curtis ( or pickpocketing the codes ) . Go out to the control tower . The most direct route is to go out the back door between the escalators on the ground floor . Move back by one of the planes to the right ( the plane closest to the wall is a good place ) , and wait until about 12 : 30 a . m . You may want to save the game prior to doing the wait . Sometime at about 12 : 55 a . m . , Curtis can be seen walking towards the tower . However you can also wait until around 2 : 50 a . m . and enter the building , he will already be in the tower talking on the radio . If you do choose to wait outside by the planes at 12 : 55 a . m . it is very important that you remain hidden ; otherwise he will confront you and ask why you ' re there . If you end the dialog successfully , he will then walk back into the base and you will need to wait until the next day ( unless you pass a speech check of 50 to keep him on course after a brief return to the terminal ) . If Curtis starts shooting at you , run outside to the tarmac , then run back to the tower without opening fire on him . Enter the tower and exit , Curtis will no longer be aggressive . It ' s possible that Curtis may not appear on the tarmac and will already be inside the tower . If the lights are on , he ' s already there . If you don ' t see him by 3 a . m . , enter the tower and stay hidden as per the next instructions . If Curtis doesn ' t see you , he will walk into the tower . Follow him inside , and stay hidden at the bottom of the stairs while you listen to him talking on the radio . The quest will update and tell you to disarm the monorail . If you have a high explosives skill ( 35 ) or high science skill ( 45 ) , you can choose to go directly to the monorail , which is accessed through a door in the Northeast corner , second floor , of the main terminal building . The bomb is located inside the train car , at the air vent , next to the inside door . Otherwise , you will have to pickpocket the Activation Code off of Curtis for a loss of . You can also confront Curtis , in which case he will become hostile , and you can kill him without loss of Karma or rep . If you kill him without confronting him , when you report to Colonel Hsu , Hsu will pull his pistol and shoot you , without giving you the option for dialogue . After Curtis becomes hostile , he is fair game to kill . Then loot the Activation Code from his body . Once the bomb is defused , if you have not already killed Curtis you may wish to return to the control tower and finish him off for the extra experience and his equipment , as well as the " history point " for Boone ' s I Forgot to Remember to Forget Companion quest . Be sure to kill and loot Curtis before speaking to Hsu , to gain extra experience you will not get if you do it afterwards ( because he commits suicide ) . Return to Hsu , he ' ll reward you with some caps and a reputation boost . Upon killing Curtis ( before reporting to Hsu ) , the NCR guards on the tarmac may turn hostile on you ( killing him silently should help avoid this problem ) , so run quickly back to the terminal . You should have no problem collecting your reward and XP from Hsu despite the hostile guards outside . You can also complete the quest and gain the Experience Points with killing Curtis in the tower before hearing the radio conversation ( though this is not recommended ) . When you report it back to Hsu , he will be surprised and tell you Curtis could not be the spy as he was the leader of the investigation . After that , it will be revealed that there ' s a bomb on the train , the explosion of which you won ' t be able to prevent . After the train explodes , report it back to Hsu , and then the quest ends , with you gaining caps and Fame , but a lesser XP reward of 350 . With the monorail destroyed , you will need a very good reputation with the NCR to complete " No , Not Much . " Detailed walkthrough ( Legion ) . After receiving the quest from Colonel Hsu , talk to Captain Curtis and choose the option " I know who you are , and I work for the Legion , too . " This option will be available after you have talked with Martina Groesbeck during The Finger of Suspicion . After talking with Curtis , follow the map marker to the garbage can in front of the ticket counter , and take everything inside it , which includes Monorail sabotage plans and the . If you don ' t take everything , you won ' t be able to frame Davey Crenshaw . After collecting all the items in the garbage can , talk to Hsu and tell him you will investigate the information leak . Then go to the monorail . If your reputation is high enough you can just walk past the soldiers . If not , then there is a change of guards at 9am and 6pm , which should give you a short time to sneak to the monorail without getting any problems with the guards . Alternatively , you can put on an NCR uniform and the guards will let you pass without attacking . Now enter the monorail , turn left , and there is a vent at the end which you can activate to plant the . The quest tells you to leave the monorail and watch it depart . Do not leave until it explodes , as it may stop the quest from being completed . Back inside the building , stay on the upper level and follow the map marker to Davey Crenshaw ' s footlocker . Put , conductor , fission battery , monorail sabotage plans and into the footlocker . Head downstairs and out through the back doors . Follow the map marker to Crenshaw , who can be killed in a special way through dialogue ( requires a 40 Sneak skill check . ) Head back inside and speak to Colonel Hsu . The first option , telling him about the evidence , will reward 100 caps , as will the second option using speech ( both are repeatable due to a bug . ) The third option doesn ' t give you anything . Head back to Curtis and tell him he ' s in the clear for 550 xp and 150 caps . Behind the scenes . " " is a 1956 song written by Screamin ' Jay Hawkins .