Twelve-year-old BFFs want to be sisters. Tillie's divorced mom plus Ginnie's widowed dad could equal a lifetime of round-the-clock girl talk. Too bad Dad vowed to never marry again. Ginnie and Tillie come up with the perfect mission to change his mind: ‘Operation Secret Sisters.’ Before long, Ginnie suspects Tillie has turned ‘Operation Secret Sisters’ into a scam called ‘Operation Steal My Dad.’ Things get more complicated when Ginnie stumbles&nbsp; across her dead mom’s hidden journals. Ginnie can finally get to know the mother she doesn’t remember and Dad doesn’t talk about … until Dad takes the journals away.