If you need gems you can "farm" them mining the bigger ore you can finish with auto damage. This way you can get gems quite fast, specially if you have a high autoattack speed.
I think this episode is worse than eps 1 and 2. It gives you too many clues (such as the shine on the fingerprints places, or the number of total clues per location). In addition, I preffer the black and white style, much more adecuated to the time the story is suppossed to happen.
I love the tower placing system. Not the ground type as in don't touch my gems, not the preestablished possitions as in kingdom rush, but a "tower carrier" building!! And even better, upgradeable!!!
Important bug: although you use a transformation card, the neutral army wont change. it will show the level and title you choose, but when you set an attack you will discover it maintains its original level.
TIPS:
1- upgrade first tesla damage, energy recovering and chain damage
2- set some ground towers at the top of towers area, they will atack air units too
3- strongest enemies appear at the bgeggining, use air atack soon.
+ if usefull
 "Cursed Dungeon"){kind=icon}
 "Idle Mine"){kind=icon}
 "Office Story"){kind=icon}
 "The Trader of Stories"){kind=icon}
 "Steampunk Tower"){kind=icon}
 "Doodle Devil"){kind=icon}
 "Earth Taken"){kind=icon}
 "Castaway"){kind=icon}
 "The Walking Dead Existence"){kind=icon}
 "Don't Escape"){kind=icon}
 "The Last Door - Chapter 1: The Letter"){kind=icon}
 "The Grey Rainbow"){kind=icon}
 "Scene of the Crime: Dream of Murder"){kind=icon}
 "Folds -- Origami Game"){kind=icon}
 "Demons vs Fairyland"){kind=icon}
 "Final Hour: World War II"){kind=icon}
 "Paladin: The Game"){kind=icon}
 "Tesla Defense"){kind=icon}
 "Hood Episode 4: Memories"){kind=icon}
We tested many times and cannot find the problem. Could you please provide us your character name and the battle report? Thanks.