The gang find an ally of theirs crystallised in the home. When they realise the crystallisation is contagious, they search the island for a vital ingredient to cure it.

Nori feels guilty about lying to Silas about the island's mysteries; Silas returns from a shipwreck dive and gets trapped inside a mirror.

The gang investigate when mine workers see a ghostly hand coming out of a rock, which may be someone trying to break through. They piece together sightings from around the island to find a pattern.