My players have captured Triel during Flood Season and, being friends with Vhlantru, they have turned her over to him for safe-keeping while they finish the Kopru Ruins.
I'm thinking that V probably doesn't want Triel talking to the party. "Sorry, during interrogation she died" or "Sorry, she managed to escape" just don't seem convincing. How does V silence Triel without raising too much suspicsion (and how do you spell that?)?
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I would have Triel 'rescued', perhaps even when the party and Vhalantru is present. This would seem legitimate to the party, avert suspicion from Vhalantru and make for an exciting encounter. Either a teleporting mad derro or a disguised female noble (his regular helper) would do the trick plus plenty of goons to combat.
Having a lovely statue of Triel in his manor during Lords of Oblivion would make for a nasty surprize for the party later on.
Good Luck
Delvesdeep
Perhaps Terseon shows up with a squad of guards, demanding Triel be turned over in order to face justice. Ideally this is witnessed by the PCs. Given her betrayal of her fellow guards, they would be quite keen to get their hands on her.
If they ask how Terseon found out V had her, there could be a couple of possible reasons:
1) Perhaps someone witnessed them taking her to V's house and alerted the guards (which works well if the PCs carried her through the streets of Cauldron on their way to V).
2) Or perhaps V himself turned her over – after all, do the PCs really expect an upstanding noble to be their personal jailer? His manor house is not equipped to hold a dangerous criminal, and maybe he even feared that she might escape and kill him. Much better that she is kept in a secure prison cell designed for just that purpose.
Of course, once she's taken away, all requests by the PCs to question or see her are refused. If they ask when her trial will take place, they are only given vague answers that it will happen "later." By the time later comes around it won’t matter. This might also be serve as some subtle foreshadowing of the corruption in the Cauldron government.
Having the PCs find her as a statue in Lords of Oblivion would be the perfect ending.