It was Dr. Black/Mr. Boddy, in the Stairwell, with the Untied Shoelace.That's how the body was mangled enough that they couldn't tell if he was shot, strangled, stabbed, etc. and why there were no bloodstains leading from the room to the stairwell. Col. Mustard Is Gonna Walk, so there.
Dr. Black faked his death, moved to the states, changed his name, and had to pull a similar stunt all over again.The names of the suspects were all code, for a Mystery Dinner Party, and it's merely coincidence and personality that Mr. Boddy's group happened to match the circle of associates he escaped from in Britain. Whether a Mr. Cadavre shows up shortly afterward in British-occupied India and starts making acquaintances, or Dr. Black's corpse is in an American grave marked "Timothy Boddy, 1878-1929" is up to the gardeners to decide.
Everybody was in on it.Mr. Boddy was a Jerk Ass who had it coming. Mrs. White was sick of having to wait on the ungrateful bastard night and day. Miss Scarlet had seduced him and wanted to get her hands on his fortune. His cousin, Ms. Peacock, was his only living relative and therefore stood to inherit. Col. Mustard served with Mr. Boddy in the military, and wanted revenge from an incident where Boddy's recklessness caused the death of innocent civilians. Professor Plum wanted to get his hands on a Tome of Eldritch Lore that Mr. Boddy kept in his library. Funny thing, nobody else knew about the others' schemes, which is why they all try to pin the murder on each other.
It was Uncle Pennybags!Yes, it was him. He knew no one would suspect that he ran Mr. Boddy over with the little car token, he killed the poor bastard, emptied the guy's pockets, and escaped to his own board game to become a millionaire.
In the movie, there is a small hidden compartment under the staircase....in which Mr. "Boddy" left a manila envelope of surprisingly accurate evidence of who his killer was and how he expected to be killed.
In the third ending of the movie, although Mr. Green was indeed a plant......He was not faking his homosexuality. He used this as an opportunity to keep up his cover by pretending to pretend to be gay. (Doesn't the non-sequiter line "now I'm going home to sleep with my wife" smack of Have I Mentioned I Am Heterosexual Today??)
Mr. Boddy wanted to be killedThe entire evening is a Batman Gambit, trying to goad one person into killing him. He avoids the legal complication/stigma of suicide and sends someone he doesn't like to jail. He plants an envelope of evidence just to make sure.
All the suspects have amnesiaMr Boddy drugged them, which is why you can implicate yourself.
Miss Scarlett is The Vamp and represents the patient's misgivings about sex.
Col. Mustard is a staunch, intimidating military figure who represents the patient's many run-ins with authority.
Mrs. White is a fastidious maid representing the patient's compulsive need to clean and organize.
Mr. Green is a Corrupt Corporate Executive or Sinister Minister who is both wealthier and more respected than the others and never mises an opportunity to remind them. He represents how society stigmatizes the mentally ill.
Prof. Plum is either a Sadist Teacher representing the patient's bad school life, his resentment toward therapists in general, or simply a transference avatar for the doctor treating him now.
Mr. Boddy is the patient's self-image, a scared and reclusive victim who feels the universe is out to get him.
Wadsworth is the patient's envisioning of his therapist, attempting to navigate amongst this sea of caustic personalities and bring them all to a satisfactory conclusion.
In the third ending of the film, Mr. Green is indeed faking being gay, but he's not a plant. He's the real blackmailer."The Chief" is there to dispose of everybody else.
All three endings happen.And I don't mean they're all plausible, I mean the three endings all occur. Professor Plum killed Mr. Boddy, Mrs. Peacock killed the cook, Colonel Mustard killed the motorist, Miss Scarlet killed Yvette and the cop, and Wadsworth kills the singing telegram girl. This is because when they realize they've all been blackmailed, they all decide to get rid of the problems on their finances (their blackmailers). Mr. Boddy wasn't the only person blackmailing people, the victims of the murders are responsible for blackmailing their killers. None of them knew any of the others were running around the mansion killing people, which is why there is always surprise when a new victim is discovered. Also, if all three endings happen, where do three guns come from? Simple - two people brought guns with them and one person had the one provided by Mr. Boddy. Thus, the 1+2+2+1/1+2+1+1 confusion.
The Singing Telegram girl did it all!When we first meet Prof. Plum, Wadsworth reveals that Plum used to be a psychiatrist who specialized in treating "paranoid and homicidal lunatics suffering from delusions of grandeur." After the singing telegram girl's body is found, Plum reveals that she used to be his patient. Is it any coincidence that a known homicidal lunatic just happened to show up at a house where multiple murders were committed that night? Col. Mustard was actually correct when he suggested that there might be someone else in the house. The telegram girl had been hiding out, and snuck through the house, making use of the secret passages, turning the power off when necessary, to kill the various victims. She then snuck out of the of the house in the dark, turned around, rang the doorbell, planning to show up at the end so that she could masquerade as a totally innocent bystander. Wadsworth, recognizing her as Plum's former patient from the photographs from earlier, realized what she had done, and realized that she would get away with it, and so shot her as punishment.
The first ending is the real one.Bear with me on this: Of the six victims, Boddy, the cook, the motorist, the cop, the singing telegram girl, and Yvette, three of them, the motorist, the cop, and the telegram girl, could have been killed by anyone. Only two people, however, had the opportunity to kill the cook: Yvette and Mrs. Peacock, as they were the only two who were alone at all during the interval in which the cook was killed. You will note that in both of the two scenarios in which Yvette did not kill the cook, it was Mrs. Peacock. However, whoever killed the cook had to have known about the secret passage from the kitchen to the study, in order to get back from the kitchen to the study without being seen, as explained by Wadsworth. Yvette could easily have known about the passages, just as Wadsworth did; if nothing else, remember that she was already at the house when Wadsworth arrived, suggesting that she would have had plenty of time to search the place and find the secret passages beforehand. So really, only Yvette could have killed the cook, and therefore only Yvette could have snuck back into the study through the secret passage to kill Boddy with the candlestick. As for who killed Yvette herself, it was clear that she was meeting someone she trusted, according to some pre-arranged plan. That means that it had to be her employer, Miss Scarlet. What must have happened is that when Wadsworth contacted Yvette to get her to work as the maid at the party, she must have then informed Scarlet. Between that and the letter, Scarlet must have figured out what was going on, and decided to use the opportunity to get rid of Boddy and his informers, while taking over Boddy's role as blackmailer.
The Cop was a paranoid schizophrenicHe may not have been a cop at all. Considering that he seems to be ranting about being in danger over the phone while the power is cut.