Everything has been a bit much to take and has Fergus a bit down, so his cousin, Gavin, sends him on a "mission" to find some lost sheep. A bit beneath Fergus' capabilities, but he takes the job to do the guy a favor. Of course, Fergus finds the sheep, but he also finds a very odd chunk of debris and discovers that it is one piece of a device that would act as a door that would unleash the end of the world and, for that matter, the solar system, as well. What's worse is the pieces of the device have some level of sentience, can "talk" and "call" to each other from across great distances and there is no known way of destroying the pieces.
If that's not bad enough, the Asiig's odd human-like agent appears and informs Fergus that it's up to him to save the solar system, although they're not sure how... and that there are other, powerful organizations looking for the pieces and that they already have collected some. In addition to the Alliance, there's some other high-tech organization and... an apocalypse cult of some sort that's actually wanting the end of the world.
To collect the rest of the as-of-yet-undiscovered pieces and determine the whereabouts of the pieces previously collected by those organizations and, um, "liberate" them will take a "Finder" of the highest skill level. And the assistance of pretty much every contact he's got. Luckily, the stakes are high enough to convince those contacts to help out and, hey, if he fails, there won't be a lot of time to feel bad about it.
I greatly enjoyed Scavenger Door and the increased amount of time spent on and near Earth, for a change. The characters are novel and interesting and it's fun to watch Fergus as he tries to cope with actually having people he cares about and is responsible for.
If you've been following The Finder Chronicles series so far, get ready for an exciting ride and some interesting revelations about our unlikely hero. If you haven't, but you're interested, I highly recommend starting with book one of the series and enjoying the whole thing.