The guilty secret of a missing key could unlock the mystery behind the tragic loss of life on board the Titanic.

Did a man called David Blair hold the key to the Titanic's demise?

Who are history’s greatest nobodies? Here you’ll meet Britain’s most intriguing yet often unknown characters. Just like in the best detective stories, the past is packed with fascinating tales that are often stranger than fiction and twice as gripping. “Invisible Lives” unpicks the people who should have made it in to our history books, from unsung heroes to the downright curious.

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Did a man called David Blair hold the key to the Titanic's demise?

Did a man called David Blair hold the key to the Titanic's demise?