Secret Files 2: Puritas Cordis is the second episode in the Secret Files series. So that makes it the sequel to Secret Files: Tunguska. Anyway, the game is out right now for iPhone and iPad, where it'll cost you £4.99 / $4.99.
Apparently this one involves volcanoes, earthquakes, and plenty of either seismic activity. Basically the world is ending, and it's up to Nina and Max to try and stop it. No pressure there, then.
This is another world-spanning point and click adventure, and if you enjoyed the first game you're going to lap up everything this one has to offer.
You can grab Secret Files 2: Puritas Cordis from the App Store by pointing and clicking at this link right here. See what I did there?