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>> in a quiet rural township in michigan, as october chilled into autumn, two young women prepared for the social event of the season. >> its gonna be great. there will be so many people. >> so they imagined. , so they hoped, in their naivete. then so many others of a particular demographic of the farms and in the small towns around moran county. >> it was a buildup that whole summer that we coordinate way to go to the halloween party. >> halloween! becky brinson and her friend chelsea...

>> i had to find her. i just -- you know, what do you do? i mean i couldnt live with myself just sitting at home and hoping that she turned up. >> chelsea was featured on datelines own missing in america series. her mother tried to stay positive. >> cannot lose hope. cannot give up. the faith and prayers has given us that hope and if anything its only gotten stronger. >> but penny and others couldnt quite keep that up. >> i know her sweet mom always had hope, and i know one time i introduced mys...

Mess. its the first time, i think, ever in my entire life of living here, like, forever that i didnt feel comfortable in my own home. >> outside, investigators took one look at mikes fire-pit and was there something in there? >> they dug through, you know, years of burning stuff. you know, having parties and >> what was that like? >> i kind of shoot my head. they had it all taped off and i think they dug all day looking in -- looking in there. >> nothing. still. was he a person of significant in...

Really, maybe, do you think it could be hers? " and i knew who he meant right away. right away. and im like, "no. theres no way. all winter? they searched everywhere here. how could they have missed it? how could they have missed it? " >> yeah. >> sheryl called the monroe county sheriffs office and deputies came to pick up the shoe. and the next day det. sroka sent a photo of the shoe to chelseas mom. >> im on the phone with her. i tell her, "i-- i just sent the email to you. did-- did you get i...