Editor's note: HLN is airing a special "Nancy Grace: America’s Missing" with the goal of trying to find 50 people over the next 50 days. Nancy Grace will take a look at several cases across the country in hopes of helping to solve them. This was the first case.
Ten-year-old Lindsey Baum was at her friend's home six blocks in away in McCleary, Washington, on June 26, 2009.
"It was just a normal beautifully sunny day," her mother Melissa Baum recalled.
Her friend's mom thought she should begin the walk home before it got too dark. She was last seen at 9:15 p.m. in the neighborhood
"She just never made it home," Melissa Baum said.
Baum spoke with HLN's Nancy Grace on the first night of a series that aims to find 50 people in 50 days.
"We saw this as an opportunity to try and go back and look at the cases that remain unsolved and try again," Grace said about the special.
For more information on Baum, her description, and information to contact authorities, visit Nancy Grace's blog.
iReport: Your stories of missing loved ones
CNN affiliate KATU's coverage of Lindsey Baum case:
Police focusing on person of interest in missing girl case
More surveillance video released in search for Lindsey Baum
Search still active for Lindsey Baum
Lindsey Baum's disappearance still a mystery
Watch Nancy Grace Monday through Sunday starting at 8 p.m. ET on HLN. For the latest from Nancy Grace click here.