It has been a while, but I'll explain it to the best of my ability.
The three contestants - Katheryn, Jim, and Steven (hereafter K, J, and S) - have just finished a challenge, and are brought to a hotel for a chance to rest before their next challenge. They are told that they have 90 minutes to shower, change, etc, before their next challenge, which will be worth some amount of money that they are told, but I cannot remember. Anderson Cooper warns them that if any contestant is late, there will be consequences.
The contestants are each escorted by bellboys to their rooms... what they don't know is that the game has already begun, and they will win if they can all get downstairs in time. As each contestant enters his or her room, the bellboy slams the door shut behind them... and the door locks from both sides... they cannot get out and no one can get in.
K and S have what seem to be standard hotel rooms. Each room has a bathroom, a bed, a phone, a hotel safe with a combination, and a security key pad on the inside of the door (which would, presumably, unlock the door, if they knew the combination).
Additionally, there are some not-so-normal items in the room that they discover as they begin to look around. K's room contains VHS copies of two Alfred Hitchcock movies -- Psycho and Rear Window, a stationary bike, and a pair of binoculars. S's room contains a padlocked minibar, several suitcases which are filled with newspapers, and a laptop computer. Additionally, these rooms contained a number of misdirectional items which were not needed in solving the puzzle, but were there to throw the contestants off.
In stark contrast to these two rooms, J's room is pitch black. There are no light sources and he cannot see anything in the dark.
The way the challenge was supposed to work
The key to the challenge actually lay with K, who was the mole, and was instructed as to how the challenge was supposed to work (she actually had a cheat sheet explaining how to get out of the rooms hidden in her shoe, just in case she forgot anything). She was supposed to help the contestants win (to regain their trust).
The first step in escaping was for K to ride the stationary bike (which she coincidentally decided to do while thinking). This powered a generator which turned on a black light in J's room. While J's room contained only a xylophone and a telephone, it also had messages written in paint on the walls which glowed under the black light. Among a number of cryptic (and threatening) statements, all three contestants room numbers were written on the walls... It was now up to J to dial their numbers on the phone so that they could devise a strategy to escape.
K's room was the easiest to open. All that she had to do was to realize that the movie Psycho was a clue to look in the shower. On the inside of the shower curtain was a four digit code... This code, when typed into the security keypad, opened her door and set her free.
The next clue was located in two places: Rear Window (in K's room) is a movie about a man who watches his neighbors from his window. When K used her binoculars from her room's window, she could see a billboard in the far distance. This billboard had a date on it... the date that the taping of the show began. A reciprocal clue was in the newspapers in S's room... every newspaper in the briefcases was published on the first date of filming, as well. Using the date as a combination, S could open his room safe, which contained a statue of the Virgin Mary.
The next clue was in the laptop computer. Four of the numerical keys were marked with a sticker. These four keys made up the combination to the mini-bar's lock. Inside the minibar was a lamb-shaped Halloween mask.
The final clue in S's room was a sheet of paper hidden in between the pages of the newspapers. This paper contained a musical score...
All of these clues were supposed to suggest the song "Mary had a Little Lamb" (which was the song written on the sheet music).
When J played "Mary had a Little Lamb" on the xylophone, his door automatically clicked open.
The final clue was hidden in the writing on the wall in J's room. Amongst the names of all of the past contestants and other people that the Molerons had met throughout the filming, there was one name which they had not heard of -- written right beside the phone number for the front desk. They had to ask the front desk if there was a package available under that name... They would then be given a large box, inside of which was a smaller box, inside of which was a smaller box, (etc), inside of which was a key. This key opened S's door from the outside.
What went wrong
K had been instructed to try not to look like the genius behind all of the escapes. She was supposed to ride the bike for a minute or two at a time until J finally called her... (Then, she was supposed to "figure out" that the bike controlled his lights.) She was supposed to get suggestions about what the Psycho and Rear Window clues might mean (these were the most obvious clues, so J and S should have suggested shower and "look out the damn rear window" right away) so that it would seem that J and S actually rescued K... Then K was supposed to take control and direct traffic from that point on (waiting until the last 30 minutes or so to build suspense by finally "figuring out" that J needed to play "Mary" and, if he hadn't already noticed it, suggesting to J that they go down to the front desk and ask about the random name)...
The problem was that J and S both knew at this point that K was the mole, and they assumed that she would be trying to sabotage the game. Thus, they only telephoned her long enough to figure out that the bike was J's power source, then hung up and tried to figure out all of the clues in their rooms without K's help. (Note: It was actually possible for them to do so, but the clues in each of their rooms were considerably more complicated than the clues in K's room).
After waiting for an hour in her room without hearing more than a few words from S and J, K finally began to act out the discovery of her clues (for the sake of the camera) and freed herself, then went to S's room and knocked on the door and tried to help him... but by that point, too much time had already been wasted, and S was VERY slow to take K's suggestions (he didn't trust her when she asked him to pass her the sheet music under the door, for example), so they did not complete the challenge.
P.s it is one not on, where not were, season not seson, and heard not herd