Rachel Rigby, 51, east London
Plunged into darkness, I tried not to panic.
It was January 2013, and I was away on a caving expedition in Brazil.
But in the depths of the cave, my torch died.
Scared, I gasped out loud.
‘Here, take mine,’ said a kind voice behind me.
After emerging from the cave, I turned to properly thank the stranger who had given me his torch.
‘I’m Giovanni,’ he smiled, holding out his hand.
Giovanni, then 29, was from São Paolo.
We got chatting, and straight away we clicked.
I told Giovanni how I’d fled to South America from my home in London five months
