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A pocket knife goes missing at the hardware store, and Al believes that one of the Taylor boys is responsible. Tim reacts badly when he finds out that Mark did it, which creates a problem in the family.
Mark's fourth grade teacher expresses her concerns about his quiet, withdrawn behavior at school. Tim and Jill have very different theories on how to coax the truth out of Mark, but neither of them are successful, and in the meantime, Mark avoids telling them about the real problem.