What are the key elements of betrayal in Haunt 28 of the board game Betrayal at House on the Hill?

In Haunt 28 of Betrayal at House on the Hill, the key elements of betrayal involve one player turning against the rest of the group by revealing a secret objective that goes against the common goal. This betrayal can lead to deception, manipulation, and conflict as the traitor tries to achieve their own objectives while the other players work together to stop them.