For future reference, I certainly wouldn't mind small "Haunting" missions. Something simple like early game Strange Creatures, except with some single ghost on a small map of some ruined house, cementary, farm and whatnot (probably some of the already existing maps could be repurposed for it). It could also help kickstart the whole arc and give players a reason and a way to build ghost tank before Asylum/Ship, with ghosts, if there's yet not much new content to be gained from their interrogation, perhaps teaching about the use of some psi items as well as stuff like period weapons in case of pirates (sabers etc). Interrogation probably should require basic parapsychology research first, though - at the same time with stuff like ectoplasm leading to it.