Clint Runge built a playroom in his home for his children, Ruby, 6, Pace, 4, and Reggie, 1, but it’s been hidden behind a secret bookshelf and up a flight of narrow stairs since before they were born.

In the attic of a 100-year-old Lincoln home is a secret that has been safeguarded for seven years.

But last month, the much-anticipated mystery was revealed.

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Clint and Kristin Runge with children, from left, Pace, Reggie and Ruby.

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The secret playroom features a table with typewriters.