From the Back Cover:
Drop into the Game World of Solaris VII, where ruthless Mafia loansharks and House hostilities are as hazardous as the infamous BattleMech duels. Whether you seek to fight your way to a tournament championship or strike it rich through gambling, Solaris has all the diversions you can afford - and all the risks you can't.
The MechWarrior's Guide to Solaris VII, a unique companion to MechWarrior, Third Edition, provides you with all the material you need to launch your own Solaris campaigns. This volume contains three new MechWarrior affiliations - ComStar, Word of Blake and the Chaos March - as well as six additional Life paths, rules for fully integrating 'Mech combat into your role playing game, background information on Solaris VII and a full length adventure.