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: Why didn't *we* think of that? Miss Jane Marple
: Because you believed what he told you. It's very dangerous to believe people - I haven't for years.
Miss Jane Marple
: There's always possibility of X. Gwenda Reed
: X? Giles Reed
: X? Miss Jane Marple
: The unknown factor... someone who hasn't appeared yet but whose presence behind the facts can be deduced.