It's not difficult to find out who.
It's easy to know what and where.
But why is harder?
Why takes patience, intelligence, determination?
Why takes over 700 of the best journalists in the world,
united by a fearless drive to unearth the truth?
Why is difficult and more important than ever before?
For the why, Financial Times.
From The Times and The Sunday Times, this is the story.
I'm Luke Jones.
Every year, thousands of men donate their sperm,
giving women and families across the world a chance to have a baby.
And usually, almost all involved never meet.
Usually.
That wasn't the case in today's story.
Almost 30 years after her brother donated his sperm,
Helen Down found herself sitting in her parents' garden,
waiting to meet the nibblings she never knew she had.
So what exactly happened at this rather unusual family reunion,
and how did these new family members unlock an even bigger mystery?