"Because your father was not the man to stand insolence from Thalassa or anybody else unless he had to.

Thalassa must have had him under his thumb in some way.

Why did I not know of this before?
It's clear enough now.

Thalassa, even if he did not commit the murder--" "He did not," she said quickly.

"He left the house with me, so he could not have done it." "Then he knows who did.