I guess his plan is to kill Alice but who would believe she'd commit suicide with the same poison she desperately drank wine to save herself from the first time. And why is the second prince still listening to his brother, he's basically been given the needed proof to incriminate him and end the investigation. With his loud he's talking about his involvement and conspiracy just have someone like the king or duke stand outside the door and listen in, it's not like eavesdropping on him has stopped working, Eve's done it multiple times and with people joining her 😆