I loved this book. One of the best SG-1 novels. Disappointed to learn this was the only won that Waggoner wrote. Jonas Quinn shows up for the first time in years. He's been working on a planetary defense system to protect Langara from the System Lords and wants Carters help reviewing their work. Carter is called away with Danniel Jackson and the rest to a planet known as Valhalla. They meet Vikings who after death on Earth have ended up here and each day battle each other and go home to get drunk and start again the next day with their comrades returning from the dead.

Quins story continues separately with their government forcing them to test the system way too early, and that goes about how you expect.

Meanwhile giant Vikings are attacking SG-1 when they find out what's really gong on after 500 years of fighting for Odin. T'ealc and O'Neal head to Langara to get Quinn's new Naquadrium battery to fix the problem on Valhalla, just in time to get trapped.

It's really a great ending that needs to read to believe. I usually only read books I own in between waiting for books to get transferred between libraries, but this one I kept going back to even when I had a book with a due date to finish.

As with every other book in the Fandomonium series there is no need to have read any other ones as it is a self contained story.