Tonight at 9 p.m.

 UPDATED 6:50 AM HST Apr 17, 2015


Police investigate when a new mother disappears on New Year's Day 2012, seemingly leaving no clues behind.

The hourlong broadcast includes insightful interviews with notable figures from the worlds of news, politics and entertainment, hosted by Elizabeth Vargas and David Muir. A revolving team of journalists from ABC News also contribute investigative stories.

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