Knowing that there must be something hidden, Dr A searches again directing Logan and Gorm to particular likely areas or possible clues (Survival check with advantage = 20

The group splits a litte bit trying to find a clue of where the tower could be, or if they had taken a wrong turn somewhere. Gorm and Logan shake their heads frustrated but Dr. A  percieves something unusual in the corner of his eye. 
Near the big rock they had to turn around he sees like a blur, similar to when it's too hot and you look in the distance. He approaches and after a few seconds of checking it he dare to touch the rock, but his hand crosses it. 

Humming with satisfaction he notices that there is a clever illuision covering the path, using the natural enviorement to make it more real, but once he peeks inside it he can see another path that follows down the crevine towards the river. Taking a few steps into it he can see the tower they were looking for.    

“Ahbut it’s over here!” Dr A says to the others whilst muttering to himself “very clever indeed!”

     Gorm turns and looks.  And looks again.  She then looks to Dr. A and then looks a third time...

     "Is it just me or did he lose his senses?" Gorm asks Logan, still not seeing it.

Logan:

"Perhaps his eyes are attuned to magical tricks better than ours," responds Logan, "Let's see what he has found."  Logan follows Doctor A's lead in hopes of finding the tower.

     Gorm trots along with Logan to go inspect what the Doctor is on about... Her head hurting and jaw dropping when the trick is finally pointed out in such a way that she sees what they are seeing.  "But... But...  " But she has no words and just shakes her head and tells herself to just accept it.

Following the path discovered by Dr. A, they soon reach the bottom of the tower that raises near the stream. It actually has two annex buildings, one with a small water mill ran by the water of stream. The other seems to be a small stable.  The place is quiet and no one comes out of the door to greet them.     

Logan:

Moving up to the border of the property, Logan calls out, “Haerun Mhammaster, we seek your counsel on a matter most important.”

If there is no answer, he will move up to the tower main door and knock loudly, repeating his declaration.

As Logan approches the door a mouth appears on it before he can knock and states.

"The Master is not at home. Please return in two moons."  

No other sounds or sings of activity came from the tower. You can hear the sound of pigs and at least one cow from the stables and the stream at the other side but no other sounds.  

     Gorm blinks at the mouth appearing and speaking...  "Huh."

     After a blink or two she turns her head over toward the sound of the pigs and cow, her feet following her gaze just a moment later.  "Master home or not, someone must be tending to the animals, no?"  So she wanders in that direction looking for a farmhand or such.

Logan:

Somewhat bemused, Logan asks the talking door, “Our business is urgent.  Where might we find the master now?”

“Ahbut it’s a lot of effort to go to if you’re not going to live here” Dr A says before continuing “and I’m not sure I believe it?” He then looks around to see if the place is truly deserted (perception = 14 or investigation = 8)

     "Maybe he's on vacation?" Gorm calls back.  "Or visiting relatives..."

Gorm peeks inside the stable only to confirm what Dr. A. nose already told him. There are animals inside. Real, living animals. Gorm can see a couple of chicken too walking around the stable and a back entrance, where the hen house must be. 

But, it seems that there's no one around tending to them. Still there is fresh food for them and clear water, and they are realtivly clean. 

Meanwhile the magic mouth repeats his message to Logan's question.

"The Master is not at home. Please return in two moons"  

Logan:

Looking to Doctor A, Logan says, “This repeating message seems odd.  It could have been left yesterday and the scholar is out for two months time, or it could have been left a year ago and the scholar should have long since returned.  Perhaps he merely wishes to remain undisturbed?”

Logan checks to see if there is any evidence of a struggle or other worrying signs that the scholar may be nearby but imprisoned and this message set to deter rescuers.

Perception:  7

((Kitchens?))

     Gorm is not particularly good around animals and so mostly avoids them other than getting a look at them.  "The animals do seem well enough tended to... Someone should be around somewhere," she calls out to the others.  She then makes her way around to the back entrance and decides to try knocking there...

( "chickens"... typo solved not sure if it was me or the autocorrector trying to understand me... 
The "back entrance" is no door to the main tower, is just an opening to allow the animals, and specially the chickens to go outside ) 

     Gorm looks at the back entrance and decides she is a little bit bigger than a chicken... She's not yet ready to try to crawl through there to get in.

     "Don't suppose any of you want to tell me where your keeper is?" Gorm asks the chickens and other livestock.  "I mean... Do you?"  She felt silly talking aloud to the animals but not nearly as much as she expected to.  In fact, it seemed to make sense.  Almost... So she tries again.  And again.  And then with a little bit of concentration and purpose she tries yet again. ((Speak with Animals cast as ritual as Totem Warrior feature.  I had forgotten about that!))

Over his long life Dr A has come across this type of spell before. He checks out the door to see if there are any traps magical or otherwise!

Logan:

Logan continues to wait for the others and look around for clues (roll a 22 prior to DNDBeyond’s error).