It seems he cant differ a manual from a gem:
The Thieves' Guild
Exits: North South
Eyes peer up at you from the cover of a leather-bound book.
A burlap bag of tools bounces against the manual to which it's attached.
A manual with leaden covers attacks its readers fingers.
Five Hands is sitting at his desk, cheating himself at solitaire.
Five Hands glows with a bright light!
<1193hp 527ma 385mv> >> - << -2 -9.3 877,171,007 163,303 indoors Aisholm Town
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You can buy:
Price Item
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43000 an uncut sapphire
7000 prong horns [4]
50000 a huge opal
70000 a huge sapphire
100000 a huge diamond
115000 a huge ruby
&1531 Five Hands' manual of the Five Fingered Art..It has a soft glowing aura!
75000 a huge emerald
----------------------
* means you need more levels to use it.
! means you are not strong enough to use it.
& means you have studied this spellbook or manual to its max.
Query may also be of use to you, please refer to help query.
<1193hp 530ma 388mv> >> - << -2 -9.3 877,171,007 163,303 indoors Aisholm Town
buy five-manual
Five Hands tells you 'Ah, sir, and what a beautifully cut gem it is.'
You now have Five Hands' manual of the Five Fingered Art.