When a long-buried skeleton is found in Old Nina's garden, the kids are set on discovering who it is, how it got there and who was responsible. Then Old Nina's long-lost son turns up, with his own kid in tow, which should be a cause for celebration. But are the pair really who they are claiming to be – or are they impostors? As Matthew, Melody and Jake investigate, they dig up jaw-dropping secrets and uncover a plot to stash some priceless jewels on the Close ...