Two years ago Labour MP Tom Watson asked the prime minister to examine a set of documents used to convict Peter Righton, an infamous paedophile, in 1992. Watson said the dossier could provide evidence of a paedophile network linked to parliament.
The Metropolitan Police then set up Operation Fernbridge to investigate claims of sexual abuse and grooming.
Later in 2013 the Home Office conducted its own investigation into handling of historical child abuse allegations. It found 13 items of information, four of which implicated Home Office officials in child abuse.
While the investigation continued, Simon Danczuk, Labour MP for Rochdale, last Tuesday asked former Home Secretary Lord Brittan to reveal any information he knew about a dossier of information compiled by former MP Geoffrey Dickens, who died in 1995.
That dossier is what everyone’s talking about now.
It consisted of allegations about an alleged paedophile ring that involved MPs and other public figures. Dickens passed the dossier to then home secretary Leon Brittan in 1983, who has said he passed it on to the Home Office. Brittan had previously denied knowing anything about the dossier.
But on Sunday it was revealed that the Home Office lost the dossier.
So why’s there so much fuss?
It's partially because the Home Office didn't mention the fact 114 documents had gone missing in their 2013 search through their archive.
In response, Tom Watson started an online petition on change.org for the government to launch a national inquiry. 80,000 people signed the petition within a day.
She said that Peter Wanless, the CEO of the NSPCC, will lead the review of Home Office handling of allegations with the assistance of a lawyer and "if necessary, the government is prepared to make it a full public inquiry."
So what's next?
An inquiry will look into the Home Office's investigation and try and explain why there wasn't any response to Dickens' allegations.
And later this week, a report will say the Home Office never funded the Paedophile Information Exchange in the 1970s, even indirectly.