Mum needs Henry to get heat protection before they can deal with the Furnace. If you have seen what you need but can't reach it, use hints for dealing with that character.
This is the low-spoiler guide for "Getting heat protection." puzzle in Henry Mosse and the Wormhole Conspiracy. Unlike in normal walkthrough, you get gradual hints on how to solve the puzzle. Click the big button below to see your first hint. If the hint contains a spoiler, you will be warned about it before clicking.