TL;DR: Nice conclusion of Adam's Venture series of puzzle adventures.
Let me start by informing you that you should really be looking at Episodes 1 and 2 first or else you'll probably be rather confused of the plot and its twists in this one, because Episode 2 ended in a tense cliffhanger. Nevertheless, I'll keep this review free of any significant spoilers.
Series puts you in the boots of Adam Venture, an adventurer-archaeologist of less renown than he thinks. However, he and his father's research group have made an interesting archaeological lead and got basically unlimited funds from a suspicious Big Corporation to go about it. While in Episode 1 and 2 you were investigating the fruits and twigs of this arrangement, Episode 3 begins by showing how it all actually started before rolling you back to resolve the cliffhanger. Quite a nice way to build the pace towards the climactic ending, really.
Episode 3 has by far the most difficult puzzles of the series, which is only a good thing. Especially the lock puzzle (however bizarre it is to have it there in the first place) of the beginning was deliciously challenging to the point of being frustrating. It took me several hours of trying to solve the multi-linear equation I devised to model it until I saw the simplicity behind it. Why'd father have to lock the door with such an elaborate design I can only account to his eccentricities.
In effect the puzzle difficulty is stepped up (still a good thing) but for many of them their placement makes less sense than in Episode 2. To list a few examples defusing an explosive makes sense (and it's cool!) as does fixing a windmill or car, but a logic puzzle door lock does not, several labyrinths on the way out of tomb make even less sense (to me anyway) and quite frankly a puzzle of arranging ladders to get up a bookshelf just feels forced.
Graphics are fine but the dynamic shadow issue of characters has bugged the series all the way from Episode 1. So characters have a shadow but it looks wrong
because the shadows of other objects behave differently. For instance, standing on a rock might show Adam's shadow but not the rock's: effectively Adam's shadow hangs on the ground, starting from nothing like he was levitating in mid-air. This becomes relevant again in few instances in Episode 3 where you have to do some basic 3D platforming and assess where you are jumping. There's not much of it but combined with the fixed camera angle it's moderately annoying.
If you already played Episode 1 and 2 you should know what to expect from Episode 3. It's good enough to enjoy but not a classic-worth puzzle adventure. After the cliffhanger of Episode 2 it is fairly obvious to an average player how the story unfolds. Curiously enough they have managed to tie the Bible-themed subtitle to the plot even in the conclusion chapter in both of its meanings.
As a single game, Episode 3 is nice but it wouldn't make right to regard it separately of the series. The series itself has an interesting story, annoying but not totally unlikable stereotypical characters and some very nice puzzles that make you feel clever if you solve them yourself. My game time with the series was about 2.5 to 3 hours per game - this third one took 3.5 hours, out of which about 1 hour was overthinking the lock puzzle while in-game. That makes it a shortish series. I'd recommend getting all of it with The Complete Pack
on sale (like this week it's -75% / 3.25 €) as it is already several years old series and it shows.