Dumbledore had kept up the façade for many years, and McGonagall never suspected a thing about those missing students and teachers. The bodies were never found.
Tommy Riddell was only too happy to accept his offer for the job. He was paid handsomely for the character of Lord Voldemort. Dumbledore himself kept up the lie, telling Harry about some bullshit prophecy, and his 'Mother's love' kept him alive when Voldemort tried to kill him as a baby, when it had actually been Dumbledore's attempt to kill Riddell with a bomb, and little Harry survived by sheer luck with only a piece of shrapnel grazing his forehead. He delighted in the tricks he created over the years - Quirrell's makeup with the smoke and mirrors. Giving him and Ginny hallucinogenic drugs to think there was a Basilisk inside the Chamber of Secrets. The 'Death Eaters' and the return of their 'Master'. The break-in at the Department of Mysteries. He laughed when Cedric Diggory begged to die inside his Death Chamber.
It came as a complete surprise when Harry found out the truth, stumbling upon the paperwork on the 'Death Eaters' fees in his office.
'Get off me! What the hell are you doing, Harry!' he protested, but Harry kicked him in the shin.
'You fucking liar, Albus Dumbledore!' shouted Harry, wanting to tear Dumbledore apart limb by limb. 'Is that even your real name? There was no bloody Voldemort, or Death Eaters! It was a lie for your fucking amusement, you piece of shit!' Harry threw a punch towards his mouth as Ron and McGonagall held him. Blood spattered across his robes and his jaw unhinged at an awkward angle.
'Please - Harry - you don't understand -' He tried to say, but Harry kicked him in the balls.
'Fuck you, Dumbledore! You ruined my fucking life! Sent me to live with the shitting Dursleys! Die in hell!'
It was no sooner than seven minutes before Harry was torturing him. He screamed louder than any of victims.
'You don't want to be worse than me!' he shouted as his legs were torn apart.
'I'm not fucking worse than you, that's just pacifist crap you used to bullshit when you the fucking Headmaster.'
Harry Potter covered the wounds best he could, and the official story was that Albus Dumbledore met something of an accident before his trial. He received a very special visitor in his last days in Azkaban. He could barely scream before the blood hit the walls.