Segaco wrote:Alder and Alpha are the culprits.
Before anything, the two got into Miles' room and stole the documents. I don't know why they would want them, possibly hired by someone?
For the first murder, they claim to have been together. However, that is not the case, as Alder just lied to give Alpha an alibi. What actually happened is that Alpha went over to Ferris' office while Catherine was in the bathroom and stabbed Ferris to death. After this, he locked the door with his master keycard and left. When he reached Alder, Alpha gave him his master keycard for the next murder.
[6 bullets]
For the second murders, after Alder stormed off, he found Micah and Nik in the hallway. He led them to the closet and stabbed them both, locking the door with Alpha's master keycard afterwards when he was out.
[6 bullets]
For the third murders, Alder left the conference room with Ruby at one point. Ruby's purple of "Alder called me over" implies Ruby was not with him when he called her, so Alder just got into the security room and stabbed Ren and Miles to death. After this, he took Ren's gun, deleted the security footage and called Ruby over to the crime scene.
[6 bullets]
As this happened, for the fourth murders, Alpha got out of the conference room and quite simply shot both Brian and Nettle with his own gun. That done, he quickly threw his gun into Ruby's office.
After searching the others, Alpha lied about no one having Ren's gun, because his partner in crime had it.
[4 bullets]
At this point, secretly while everyone else was distracted/doing something else, Alder gave the master keycard back to Alpha, and Alpha whispered to Alder where he could find his gun
(because Alpha's gun has space for more bullets, while Ren's only has 6).
[4 bullets]
For the fifth murder, Alder had possibly set the sirens to play at one point, and he used this chance to say he had heard a gunshot to go over and check on Ruby. He entered the room she was in (her office), took the gun Alpha had left there, shot her, and then left. The gunshot was muffled by the sirens.
Ruby's office was not locked as Alder had said, so Alpha just opened it.
[3 bullets]
For the sixth murders, Alder separated from the group, lying when he said he was going to the conference room. When he saw his soon to be victims (Menna & Steve), he shot them both. As for the three shots, there are two possibilities:
A) He shot one of them once and the other twice.
B) He missed one of the shots.
[0 bullets]
After this, he quickly went on and hid in the room closest to him: Catherine's.
While everyone searched for him, Catherine entered her office and found him. Alder did not spare her and quickly stabbed her to death.
Alpha eventually found him in the room with the corpse, and Alder gave him the two guns: Ren's fully loaded gun and Alpha's own gun.
Alpha lied about finding Alder in Ferris' office.
[0 bullets]
Finally, at the end, Alpha went over to Tony's office. There, he locked the room from the inside, shot his own gun to the ceiling and hid it in the room.
After this, he laid down on the floor and feigned death. When Alder arrived, he lied about Alpha having been shot and about him being dead. The gun Tom and Tony checked was Ren's, which had not been used at any point, so no contradictions were made.