A kind of obsession

 is a Sunless Sea Random Event. It has a chance of 1% to come up.

Trigger conditions
 is triggered while at zee and have the following:  Live Specimen ≥ 1 Terror ≥ 50 and ≤ 75 

Event description
A stoker approaches you on deck. “Captain,” she says, “that thing in the hold. It's dreaming about us. It means us no good. No good at all.”