Locations:The Torrid Top and The Secondary Caldera Prerequisite: Complete The Mystery of the Missing Mer-Booty, and The Ring quest from Pompeii and environs.
From the in-game news item: Have you helped Investigator Kaine with his underwater mystery? Have you also saved the village of Pompeii from impending doom? Well then, it's time to do Investigator Kaine's Volcano Mystery! Talk to the Town Crier in the Commons to get started, then head back to the Volcano for some hot, hot, hot fun!
The official Codename blog for this adventure is here.
Investigator Kaine has been asked to help deal with another emergency on the Volcanic Islands. You'd better get over there quickly! You can find him in the Torrid Top.
Exploding Mountain Mystery
Help Kaine try to cool the volcano
Another Volcanic Caldera is threatening the poor people of Pompeii! Investigator Kaine has been tasked with stopping to from exploding! Help him as he tries various Volcanic remedies.
A Cooling Breeze
Complete the puzzle to gain access to the caldera Find 15 Quantum Cooling Devices
Investigator Kaine would like to try cooling the lava in the Caldera so that it hardens over and caps the flow. It's worth a try, I guess.
Relieve the Pressure
Make your way across the caldera Complete the puzzle to access the old lava tube Find 24 Pickaxes
Investigator Kaine would like to try opening up a secondary flow that can redirect some of the lava safely away from Pompeii. It could work, perhaps.
Carefully Controlled Demolition
Find 18 Lava Radars Make your way to the left side of the caldera Complete the puzzle to find the main flow area Find 40 Sticks of Dynamite
Investigator Kaine would like to try causing some minor earthquakes to try to block the flow of lava to the Caldera. It couldn't hurt to try.
The Obvious Solution
Raise at least 60% of the platforms in the Caldera Return to Investigator Kaine
Investigator Kaine would like to try blocking the Caldera directly using the weird floating platforms that you've been using to get around. Move from platform to platform until 60% of the platforms are raised, then see what happens...