This book does two things--(1) provides a brief description of one of the bloodiest battles of the Civil War; (2) serves as a guide to the battlefield for those who wish to visit the site and make sense of the battle.
In terms of production values, not wonderful (although it is serviceable). The photos are not of great quality; some are a bit hard to make out. The maps, too, are okay, but not as informative as in other books on this and other battles.
But the story of the battle is well done, despite its brevity. It describes the race between Lee and Grant/Meade to get to Spottsylvania Courthouse first. The Confederates just barely won, or the outcome might well have been far different. The book details the role of cavalry at the outset and the effort made by Anderson's First Corps (after Longstreet had been wounded in the Wilderness) to reach the destination. Then, a variety of episodes are explained--from Sheridan's jousting with the Confederate cavalry (and the death of JEB Stuart) to Upton's attack to its reprise by the full Second Corps to ongoing conflict over the nearly two week battle. The story ends by noting the campaign's future battles.
Some useful features: the description of how to reach key parts of the battlefield, the order of battle, and a history of the battlefield after the battle had ended.
If you want a punchy description of the battle and an introduction to the battlefield, a very useful volume.