With that attitude there wouldn’t be murders anymore. But there are, so we have to assume there are limitations on what either Speak with Dead can do or how available it is. Our investigator isn’t a spellcaster, or lieutenant Hanthorpe already cast it to no effect (standard procedure at BGPD)
How to get around things like Speak with Dead is a bit of a topic in D&D; considering how prevalent Speak with Dead is in the EA it is a little odd they don’t address it here.
