How many people take a secret to their grave?

How often does that happen? You either never find out because the person kept it to themselves and didn't even write about it, you find out when they're already dead or they confess it to you on their deathbed (likely old age), on their final moments.

You know they always say the phrase "you've dodged a bullet" to those that find out a lot sooner. How many people aren't that luck and the person got away with it for many years and even die with the secret?

How many people take a secret to their grave?
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