I knew it was going to be interesting but this story continues to surprise me. That crown prince though, he's been planning things for a long time. In the beginning I was thinking he wanted a pliable partner, one who wouldn't interfere or threaten his power but it definitely looks like more than that. Plus timing of things must be important. If he needed Polly for something still he would keep her alive, but he's trying to kill her. On the other hand, if having her die was the main point, that could have been done any number of ways much earlier. So either Polly has already fulfilled her purpose, or it serves an important role to have her die now. It gets more and more curious.
It's also interesting to see Medea and Polly's backstories and this is a story where their backgrounds actually strongly impact their behaviors and goals. I have to admit I wasn't expecting them to have been friends, but it fits now why their relationship ended up so twisted. After all, Medea didn't seem like the type to hate someone so much for simply holding the position she covets.