@cloudystar: It's absolutely still open.
As for a summary... the Iron Roses were sent to deal with some bandits who were causing trouble. They did, killing or taking them all prisoner. Then the captain an invitation to a party thrown by the princess, which they attended. However, an assassination attempt was made on the princess. It failed and the Iron Roses learned what was going on from the Assassin, who was being blackmailed.
Right now, the ones who went after the conspirators are cleaning up and taking the last living one, as well as a demon armor that had been adorning and ally, back. There are some knights keeping watch on the Princess, and a few still at their base, Candaeln.