Have they found the man who took Madeleine McCann? Police in the UK, Portugal and Germany are appealing this week for information about a new suspect - the latest development in a story which has gripped, fascinated and divided millions of armchair detectives since the evening 13 years ago when the three-year-old disappeared.
There have been many other suspects in the case. This one is different.
The evidence against German paedophile Christian Brueckner (43) may only be circumstantial.
But it's powerful and persuasive.
Brueckner, currently in a German prison, was convicted of the rape of a 72-year-old American woman living in the Algarve after he'd reportedly shown a video of the attack to someone who then went to police.
Crucially, that same witness claimed that Brueckner had boasted of knowing something about the McCann case.
Brueckner, who'd been living in Portugal in 2007, has other convictions for sex offences against young girls. He was known to steal from hotels and holiday apartments in Praia da Luz, where the McCanns were staying. He was in the area on the night Madeleine disappeared. He'd received a phone call not long before she was reported missing.
The next day he re-registered his Jaguar car in the name of another person.
He resembles a photofit of a man said to have been seen acting suspiciously near the McCanns' apartment.
It may be pretty convincing, all this, to you and me.
But for investigating officers solid evidence is required.
There's no need to rehash here the timeline of events that followed the little girl's disappearance in 2007.
The world entire knows the story. The endless twists and turns.
Madeleine's parents Kate and Gerry have rarely been out of the headlines. Their search to find out what happened to their daughter has been relentless.
They've been sorely castigated for leaving their three small children alone that night.
Leaving the children was undoubtedly a grave mistake. But as parents we all make mistakes.
There but for the grace of circumstance...
But it was that circumstance, that twist, that was the cornerstone of so much debate about the case. Right from the beginning the story was bigger than 'child goes missing'.
The amount of money being spent on the case - now over £11m - was also criticised. The McCanns had connections in high places. Not without some justification, the question was asked: would the Government have put the same funding and effort into the search for a working-class child?
Whoever you blame there, though, it can't be two parents desperate to discover what happened to their own little girl.
The Madeleine McCann story from start to finish has been woven with claim and counter-claim, embroidered with rumour and wild supposition. There have been countless books, TV programmes, allegations and theories.
Even the investigators clashed. Frequently.
And somewhere in the midst of all that it was as though Madeleine herself got sidelined.
There has, though, been one calm voice of genuinely authoritative insight.
Belfast man Jim Gamble, the former top police officer and now leader in child protection, is a frequent media commentator on the case.
Jim's foremost attribute isn't just his expertise. It's his humanity. You listen to him and what you are hearing is not only a man who knows the ins and outs of the case, but one who never loses sight of the human tragedy at the centre of it.
I've just finished reading The Five by Hallie Rubenhold, a book that tells the story of five women murdered in London in 1888. Very little has ever been written about their lives. Their deaths, however, - a different matter.
The five women were the victims of Jack the Ripper.
The book is a reminder of how the tragedy of lives lost is often eclipsed by the clamour of whodunnit.
Have they found the man who took Madeleine McCann? Time will tell.
But two things we know.
For the investigators who require conclusive proof, it will only be over when it's over.
For the family of Madeleine McCann, it's doubtful it ever will.
Face masks a small price to pay
Should masks be mandatory? As the debate gathers over that one I think we can take it that compulsory face-covering may indeed be headed our way. I've worn a mask (surgical, not paramilitary) a few times and can report that it takes a wee bit of getting used to. It tends to slip up over your eyes when you look down. It's a bit hot. And if you wear lipstick, it's not a great look when you take the mask off. But in the great scheme of things re Covid, a small price to pay for release from lockdown.
Woeful Trump plays to his base
On a scale of one to woeful, how bad has Donald Trump been in terms of handling crisis this week?
Most of the rest of the world has looked on open-mouthed as he's swaggered around to the tune of Macho Man with his country engulfed in turmoil. Maybe his friend in Pyongyang was impressed, though. And sadly Trump's voter base may not be as repulsed as we might think.
Will it harm his re-election chances? Possibly not when the alternative is Joe Biden.
Immigrants from Hong Kong will be welcome addition
There's been new unrest in Hong Kong this week as the totalitarian regime of China's Xi Jingping flexes muscle, conveniently against a backdrop of a global coronavirus emergency.
The 'one country, two systems' policy is being ditched in favour of 'do as Beijing tells you, or else...'
New security laws are being proposed, which would curtail the rights of the people of Hong Kong. Disrespecting the Chinese national anthem will become a criminal offence.
Presumably it's open to the Beijing authorities to decide how that will be interpreted... and who will be charged.
This week Boris Johnson has made clear he will pave the way for millions of Hong Kong citizens who hold British passports to come to the UK.
We should look to take advantage of that here in Northern Ireland, where there is already a long-established Chinese community.
Mostly from Hong Kong originally but augmented in recent years by people from the mainland, they have played a valuable and vital role, contributing so much to life in this place.
If Boris's plan goes ahead we should throw out the welcome mat.
Not just because we may be able to provide a sanctuary for those fleeing the Beijing crackdown.
But also because those people and their skills will benefit us all.