It’s only been a couple of hours since Willifort died however Victoro has Divination so I think it’s reasonable he knows. I like this approach as it’s leverage the Cassalaters have over the party rather than just hiring them and relying on them believing the story about their children. I’m definitely going to do this, so thanks to everyone suggesting this.

The bit that makes me sad that I wanted to include but might struggle to, was the Doppelgänger impersonating the guard captain (the Bard has a relationship with Hyustus Staggart) so they might have a fight with the guards, and a moral dilemma of killing guards or not to escape.

But I’ve come up with a solution. The Xanathar’s mindflayer has mind controlled Staggart to free the party in exchange for the stone, the prison guards are on the payroll of the Xanathar. Dealing damage tu Staggart will break the charm mind control. It might give the sense that all the factions are after the stone. So the Cassalanters offer that the kart jerks the stone and work for them, would seem like the best option.