Truth comes out

Marceline's lips moved, but for the first five seconds no words came out, as she tried to understand how Eve could even know about it. She was alone, and the servant had not seen her. The vampiress shook her head, denying, "Your servant? He's perfectly healthy and is married to Rosetta. What are you talking about?" 

"I know what you did, Marceline. Vincent and I both know, so tell me why you tried to kill Eugene. Was it because you knew his death would cause me pain as he is dear to me?" Eve asked the vampiress, who now held a frozen expression on her face.