Athena narrowed her eyes at the knife, at the insinuated threat, at the horrified realisation in Marcie's voice. Where did you get that, and then, don't hurt him; instant recognition for both the knife and the implied target.
What was it Marcie had told her about the knife she had used to kill Apollo? She'd snatched it up from the nightstand. Her boyfriend had given it to her for self defence. Her boyfriend, the interestingly-named Tragos.
"Yes, Apollo," she said, her voice all acid, eyes sharp. We had a deal, you bastard. "What, exactly, is happening?"