The Mystery Twins are back in that one strange town again. But when they arrive, they find out that a friend of theirs went missing, and no one knows where he might have went. Along the way of searching for their missing friend, they uncover a big secret they were never supposed to find. A secret that no one else was supposed to find. A secret that could change their lives for ever. © where'd you go | Gravity Falls, created on 31 July 2014. Story plot line and book cover created by SincerelyMA.