As her family and an investigator working on behalf of Dr. Phil follow every lead they have to find missing 16-year-old Darbi, he lets the teenager's parents know that she’s at a “real threshold” in her life.

Part one of this two-part Dr. Phil airs Monday. Then on Tuesday, find out where a shocking phone call leads investigators on their search for the missing teenager.

Check here for your local listing.

To report a missing child or teenager who you believe may be in danger, contact the National Center for Missing and Exploited Children at 1-800-THE-LOST. (1-800-843-5678) Learn more at www.missingkids.com.

TELL DR. PHIL YOUR STORY: I'm Living a Nightmare!

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Woman Claims Missing Niece’s Parents ‘Are So Busy Hating Each Other That They’ve Completely Lost Focus’