Atomic Robo and the Temple of Od is written by Brian Clevinger and Scott Wegener.
Atomic Robo is in pre-World War II China, where the Imperial Japanese Army is forcing a Chinese scientist to work on a super weapon. Fortunately, the good guys have volunteered Robo to save the scientist.
There’s a bit of a Casablanca feel to this tale, since Robo’s working with an old flame, Helen McAllister and her new love, Chen Zhen, both of whom are fighting for the Chinese Resistance.
“Was that a real explosion?”
“It was! Robo’s alive!”
Add in a hidden fortress and a constantly-switching-sides band of mercenaries called the Ghost Bandits, and it’s a winner of a tale.