With Mick gone Mara befriends Jerome and Alfie feels abandoned. While some of the Sibuna crew feel that the mysteries are now resolved, Nina wants to continue and Fabian agrees. However he loses one of the puzzle pieces. That night, Sarah appears to Nina in her sleep and gives her a mysterious message.

Fabian tells Nina that he lost one of the puzzle pieces but Patricia gets it back from Alfie. Meanwhile Jerome volunteers to manage Mara's election campaign. And the Sibuna crew are shaken when they solve the next part of the puzzle using Sarah's mystery numbers.

Fabian figures out that the newest riddle refers to the grandfather clock in the hallway but the secret compartment is empty. Alfie catches him in the search and the Sibuna crew misleads Alfie with a story about aliens.