On Monday's all-new episode of One Tree Hill, Peyton receives some startling news that she must share with Lucas who discovers that Julian has been keeping another secret from him.

Meanwhile, Brooke's search for runaway Sam forces her to confront her own feelings about the night of her attack, and Nathan struggles in a new professional environment.

Here's a clip from "Things A Mama Don't Know" ...

[video url="/videos/things-a-mama-dont-know-preview/" title="Things A Mama Don't Know Preview"] [/video]

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