reporter: the klugs are a loving family, naming their new little girl andrea, an only child enjoying piano, swimming, gymnastics. flash forward 31 years, baby girl beach is now andrea klug-napier, who lives in colorado and works as an office manager in a medical office. she had no idea of the strange circumstances around her birth until age 16 when her adoptive parents finally told her. >> they told me that i was abandoned at the hospital. and i could not believe it. but this story is -- this is crazy. >> reporter: a crazy mystery she feels compelled to solve. you have a tattoo. >> i do. >> reporter: what does it say? >> it says, "baby girl beach." >> reporter: "baby girl beach." because that -- that was sort of your identity in the beginning. >> right. >> reporter: you're living a pretty happy life. you've got lovely parents. why do you need to go looking if you're pretty happy with where you are? >> there's always going to be a void that you don't know about. i just have always wanted to meet whoever she was. >> reporter: that "she," the mother who walked out on her hours after her birth was now the center of andrea's quest. she turns to social media to find her. >> my name