Because the scrolls arrived wrapped in mystery, they attracted claims that outrun the evidence, and honesty means naming what they are not.
There is no New Testament among them. Every scroll is Jewish, and the collection was hidden by AD 68, within a generation of the crucifixion, by a community that was not Christian; the scrolls never mention Jesus, Paul, or the church. (A single sensational claim in the 1970s–90s, that a tiny Greek scrap called 7Q5 was a fragment of Mark's Gospel, has been rejected by nearly all specialists as too small and uncertain to identify.) There is no hidden or suppressed gospel, no lost life of Jesus, no secret that "the church buried." That storyline belongs to novels, not to the manuscripts; the non-biblical scrolls are Jewish rulebooks, hymns, and commentaries, not alternative Christianities.
They do not rewrite the Old Testament. As we have seen, their overwhelming testimony is the stability of the Hebrew text, not its subversion. What the scrolls did include, besides the biblical books, were Hebrew and Aramaic copies of Jewish works already known from later translations, Tobit, Sirach, and the pseudepigrapha 1 Enoch and Jubilees, which Bubble Bible holds as their own corpus; their presence shows these books were read in the era, and feeds (without settling) the old question of which books different communities regarded as Scripture, a canon that Judaism and the Christian traditions each drew in their own way (Luke 24:44). The plain truth is more impressive than the myths: the oldest Bibles we possess, and a vivid firsthand look at the Judaism of Jesus' century, but no smoking gun, and no cover-up.