A party needs an information. The information they need was known years, decades, centuries or perhaps even millenium ago, but now is lost to time and can be found only in very rare scripts. And so the party starts to look for one. From someone (maybe informant, but who knows?) they learn of possible location of manuscripts of [someone probably known, who'll probably be important]. After many adventures finally they arrive to their destination. Upon seeing it they realise that reading it won't be as easy as it seems - all of the notes look like they were made by a student who didn't feel the need to write everything down on a lesson (maybe it's even the case) and the written parts are in chaos (many parchments, without an order and with way t5o many irrelevant notes scattered across it (unless... They're not as irrelevant as they seem)). And so now the party either needs to figure it out themselves, summon the author or find more notes.