You are sure that this was the only effect? Nothing that we can't perceive, like a change of atmosphere in the house? This is a classic sign of spectre presence - or it would be, if the ghosts here deigned to behave.
Zell is leaving a sample of the blood for me to test. I'll let you know the results.
@Mnemosyne; text
Zell is leaving a sample of the blood for me to test. I'll let you know the results.