What book you think is a must have? -- ANY for D&D

[Sanackranib]

Yeah but who said they are necesarily thieves? Perhaps they just got the stuff whole sale from someone else? Doesn't necessarily make them theives if they didn't know it was stolen.

Ah but if you have to "buy it" then you might as well run a shop - but thats a whole different kind of thieving

 

[Nightfall]

Exactly and then all you have is dishonest businessmen. Hardly what I'd call a thieve guild.

 

[Sanackranib]

unless they are organized in which case you have a cartel which is just a fancy word for thieves guild

 

[Nightfall]

No then it's just a league of merchants with similar business practices. They don't have to be murders and thugs to still be just unethical business men.

 

[Sanackranib]

sooner or later someone would realize that the profit margin is higher if you cut out the middleman.

The quintissential rogue is also a fine addition although there is some overlap.

 

[Nightfall]

San,

Quint Rogue isn't too bad. But Book of Challenges has a few ideas you can mine out.

But yeah cutting out the middleman might work...but only if you don't care about people breathing down your necks.

 

[Dinkeldog]

If you want psionic characters, Mindscapes is a must. (Also download the Mind's Eye compilation .pdf from Wizard's site.)

Monsters of Faerun gives you a few monsters that I don't like to be without, like Abishai and Deep Dragons.

That would be my list of must-haves. I end up carrying them to any game I'm DMing.

 

[Psion]

I don't think I'd call any campaign setting -- Midnight or otherwise -- a must-buy.

I even wouldn't quite call BotR a must-buy. Close, though. I would say that most people out there could get some use from it as a great inspirational resource at the very least, but those with well established existing pantheons might not get much use out of it.

I am having trouble finding anything I'd call a must buy without adding an "if you want/need" to the end of it. Different GMs have different needs.

Edit: To be more helpful to the original poster, I'll counter with a "you should strongly consider" list with the most general D&D entries:

Book of the Righteous
Tome of Horrors
Monsters Handbook
Manual of the Planes
Relics & Rituals
Beyond Monks
Book of Eldritch Might I
Necromancer's Legacy
Legions of Hell

 

[Crothian]

For thieves Guilds I actually perfer the second edition book Den of Thieves. I thought it did a great job of showing a guild.

 

[ForceUser]

A Magical Medieval Society: Western Europe. No contest, not even close. This book is a must-have for DMs.