ROTFL <img src="/ubbthreads/images/graemlins/up.gif" alt="" />
1. Get quest from Trevor/merchant guildmaster/Verdistis and Marcus
2. Find wagon, report to M.
3. Return with wheel, look for clues (corpses, cave, TAKE letter)
4. Report which clues(with letter) you found to M. - get a clue to talk with Tingalf.
5. Tingalf says: new lair under my feet
6. Go into the Ars sewers, fight, corpse, TAKE letter (and the nifty 2-hander Singing Blade <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />)
7. Go to Lt. Robin, 2 speech options, use both
8. Report to M and later on to Trevor.
Sorry, to spoil, but both quests are related - and very easily busted, though I tried to keep out the details.
Kiya