The Apprentice is the fourth chapter of Amicia's and Hugo's tale in A Plague: Innocence. This time, the siblings must pass by the Inquisition patrols to get to Dr. Laurentius's farm. The man is a friend of the family.
The path to Laurentius's farm
You start your journey in the fields near Laurentius's farm. Unfortunately, the road is well guarded by the Inquisition. Follow the path - you will encounter a cart blocking the way. To hide in the nearby bushes. You will see two opponents. Wait until one of them leaves. Then, throw a stone into the weapons container . This will grab the guard's attention. Wait until the enemy starts returning to his initial post - this is the moment where you should sneak .
After that, you will find another enemy blocking the path. Hide behind cover, the one right next to the enemy. Take the vessel standing there and throw it in the direction from which you came. Thanks to that you will be able to move further safely.
You reach a roadblock - you have to go around it. Go into the tall grass. One enemy is patrolling this area. You'll have to distract him twice. Do it by throwing a rock at the scarecrow. Send Hugo to open the windows after the first distraction. Distract the enemy for the second time and then follow the boy.
Once you are in the cabin, exit through the second door. Watch out for the guard. Distract him by throwing the vessel found in the room out the window. Then, sneak into the nearest bushes.
Reach the bridge. Wait for the guard to get on it and then go to the other side of the street.
You reach a small warehouse. Watch out for the enemy patrolling the footbridge. You must hide from him. The best way to do that is to go under the footbridge. As soon as he turns his back to you, go to the stairs and use the vessel to distract the next guard. You can now jump out the window.
Follow the path - you reach the end the field guarded by another Inquisition patrol. Get inside the building.
Take a vessel from it. Wait until the enemy patrolling the area will turn his back to you. Then, jump out the window into the tall grass. Use the vase to distract the guard standing at the entrance. Thanks to this, you will be able to get into the grass.
Pay attention to the patrol and sneak through the grass. You will reach a wooden barricade. Two guards are standing next to it. You have to distract them both at the same time. Throw a rock at the scarecrow and at the container with armor. Wait for the enemies to turn towards these objects and then move to the grass.
You have to sneak through the grass and avoid guards patrolling the area. Once you reach the grass adjacent to the small wall, take the vessel  and throw it on the road in the direction from which you came. This will distract the guard and give you an opportunity to sneak into the grass . From here, you can reach the ruins.
The night falls. You have to carry Hugo for a while - this will slow you down considerably. However, you won't come across any enemies. When the threat comes, you will be able to move freely.
The rats are coming out - follow the wooden path. Climb up and shoot the chain holding an animal with your slingshot - this will clear the path. Then, approach the fireplace and take a stick. Don't set it on fire here! Head towards the road leading uphill. Light it from the lantern and then go towards the cart.
Set it on fire. Then, push the cart towards the gate. Thanks to that, you will reach Laurentius's farm. The man is in the house. To get there, you need to go to the door located on the side that can't be seen from the entrance. A window is next to that door. Tell Hugo to go through it and open the door from the inside. Go upstairs and talk to the doctor.
After talking to the doctor, you will have to go with Lucas to the lab. Unfortunately, rats got inside the house. Shoot down the meat hanging in the corner, and break the lamp. This will allow you to go further.
Follow Lucas to the barn. It turns out that the road is blocked by rats. Use the pig to distract them. Take the bag with food and move it to the building. Then go with Lucas to the stairs, which will lead you to one floor higher. From there, shoot down the lamps.
Now you can get to the lab. Go down the ladder to the barn, then go through the hatch in the floor. On the spot, you will need to collect raw materials and give them to Lucas. At this point, you will be given a recipe for Ignifer. Create a few of these missiles, because they will come in handy soon.
Rats get into the room about now. Use Ignifier on the furnace and go out into the barn. Light up the fireplace there with another missile. You can get out of the building.
The final stage of this Chapter is escaping to the boat. Your only task in this sequence is to set fire to subsequent smoldering objects, so as to remain in the light. You have to hurry, though. Hay burns quickly, and if you stand on one for too long, it can go out.