Search the secret archives for the file
From Fallen London Wiki
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From: Spiralling Deeper
You know the year, the author, and, most importantly, the card catalogue system.
Unlocked with 
Associating with a Youthful Naturalist 25
Success
Dust and outdated theories
Cabinets line the archives, filled with studies conducted by different club members [...] You recognise the Implacable Detective's handwriting. [...] You'll need more time to analyse this. You slip the file under your arm, and then you slip back to the street. [...]
Success Instructions: Bring the file to the Youthful Naturalist to learn more.
You've obtained the Implacable Detective's old research. (Sets Associating with a Youthful Naturalist to 30)
You've gained 1 x Volume of Collated Research
