In a family whose secrets are slowly being revealed, can keeping one more really hurt all that much?

Mattie and Beth were twin sisters who shared everything - even their deepest, darkest secrets. They soon discover, however, that not everyone in their family has been so open with them. First they discover their mother has a secret. Soon, Mattie starts keeping secrets. When she disappears, Beth has overheard enough to know her secret, enough to possibly help find Mattie and bring her back to Riverside. But, Mattie always got what Beth wanted. Now, Beth could reveal what she knows and help find Mattie, or she could finally become the twin with all the attention. When the unthinkable happens, Beth is forced to share what she knows. But will it be too little, too late? Have they kept one secret too many?