Cris/Lindsay/Kam will each get to investigate one of the rooms while Melina will go wherever Kam does.
After the investigation time is over Melina will pose the idea of leaving Kam alone..... This would involve Cris and Lindsay coming to her side so Kam can die. This allows Melina to have all 3 rooms and it eliminates a strong threat in Kam. This also helps Melina since Kam thinks she is the killer.
However Cris and Lindsay will refuse. Now Melina's back is against the wall. Lucky enough for her, she solves the riddle. Cris and Lindsay come crawling back and say they will take the offer. Melina gives them half of the information.
At the ceremony Kam and Lindsay will be scared. Kam will die!
Those are my predictions. And btw Melina is the killer #Whodunnit