Tell the king of the plot against him

You rush to the king and tell him of the plot at hand. He is surprised, but he understands... Yet he wouldn't believe his life to be in danger...

Lily: My lord! How could you not be in danger?!

Charles: Baroness Lily, I welcome your caution, but there is no need to overestimate Henri's power and reach. He wants me dead, that is no secret, but he would not dare to act like this.

Lily: No, you are the one underestimating him! Please, trust me, he would send assassins to have you murdered by poison!

Charles: Lily, please calm down, without any proof we can not do anything anyway!

Lily: But I have proof! Here, look at this! This was given to one of his "trusted subjects", to poison you with it! Is that not enough proof?

Charles: How did you get that?

Lily: Well... A woman can have her ways, but that is not important now! All that matters is that it would have been used against you!

Charles: Hmm... That would be enough to have him stand trial and order his execution, but we can not prove this was handed out by him and his supporters would no doubt start a revolt right away.

Lily: So what do you propose?

Charles: I suggest we chose one of two options... First, we leave him be and be on our guard, without letting the matter drop. The other is to use his own weapon against him...

Lily: Only dealing in absolutes, are we?

Charles: In such dire times, one must chose the extremes to succeed.