Overwhelming victory for option 3. Poor secretary... I will keep in mind Zwist's suggestion to look for places where a man could hide. I always try to listen to your suggestions if possible
37 – A hand in the dark ?
You decide to let the advisor bring the secretary away, and to use the opportunity to investigate the crime scene with less supervision. The secretary screams his innocence as they bring him away, but you reason you can always petition for his innocence later if you find evidence he did not commit the murder. Three soldiers stay here with you. A pity, looks like you won't be able to peruse the guild documents in the libraries.
You start out by inspecting the cupboard and the cabinet. Though you can't start reading, you make sure there's nothing out of place here. No weapons, no place to hide, no obviously missing items. Hmm, seems nothing is out of the ordinary.
Then you look around the room, but there's not much else besides the desk, and certainly no place to hide. You take a look at the desk, and sure it's empty. Oh, the drawers are empty as well. Ok, this is strange, wasn't the merchant supposed to work on some documents? Where are the documents? There's nothing here, it really does seem that whomever killed Herzil... fled with the documents? So... if it was the secretary, he either has them, or he hid them somewhere... You must keep this in mind.
You move on to the body, sitting on a chair and with the head laying on the desk with a big pool of blood under him. You ask the soldiers to help you pull the body up... They cringe a bit at the thought but agree. And here you notice something strange. The pool of blood is rather big yes, but it's rather.. regular. Isn't someone whose throat is cut supposed to trash around at least a bit? There's no drops of blood anywhere. Not on the floor, nor on most of the merchant's clothes. It's as if the merchant had his head on the desk already, and someone cut his throat, and he didn't even twitch.
You keep looking the crime scene, but are out of other ideas. However, when you're about to give up you notice something that immediately strikes you as important. The dead man's fingers are.. yellow? A dark, yellow shade that is hard to see in the torchlight, but still you're sure it's there. You ask one of the man to open the window, maybe you'll see better. But once he reaches the window, he speaks in a surprised tone.
"Oh look, I thought it was closed, but the window is actually open" You quickly move to take a look, and sure enough the window is slightly ajar. There are heavy bars though, no man could pass through. But maybe you could go and take a look under it, see if something was thrown out.
Back to the body for now though. You tell the soldiers you want to disrobe the merchant, search for other possible causes of death. They cringe, but agree. You start with the torso, and there immediately you find the answer for the yellow fingers. On the back of the man, near the neck, there's an... insect sting? Or maybe, a prick? Anyway, a small injury... and around it, a rather large yellow-purple blotch on the skin. You are no expert by any mean, but you remember your mother lessons on healing clearly. This is the work of poison. This man was poisoned, either through a prick, or maybe an insect sting. You wonder if this was the cause of death....
You look around, but find nothing else. You ask two soldiers to stay here until you can talk to the Lord, so that nobody can alter the scene. With the other man, you go outside, under the window. You look around carefully, but see nothing of interest, nothing that could have been thrown out either. You are about to go back inside, maybe try to ask some questions to other merchants, when Lord Tilash arrives.
"Well Kyoss, my advisor brought back a screaming secretary and accused him of the murder. But I noticed you did not come back with him. Why is that?"
Better not lie here. You explain that you wanted to look around better, because you were not convinced that every possibility had been taken into consideration.
"Good, and? Did you find anything? Do you have any other theories?"
What are you going to tell to Lord Tilash? What is your reconstruction of the murder? What do you suggest to do from now on? (open update)
Go, medieval-fantasy Sherlock
EDIT: a couple more answers, as written below.
1) No human being can pass through those bars, unless there's a way to open them. They spaces are small enough to block even dogs.
2) The window is on the second floor, facing a small alley. It's not very trafficked.