On this page of the Desperados 3 game guide, you can find the final part of the walkthrough description of Mission 15 - A Captain of Industry. Our solution tells us how to sneak into the location with the car and how to correctly transfer the kidnapped Devitt to the vehicle used to leave the mission area.
Our walkthrough of Mission 15 contains references to the map in the world atlas, which can be found on the first page of this chapter. For example, the designation (M15,5) indicates that you should find the blue point no. 5 on the mission 15 map.
The last part of the mission involves moving the bound Devitt into a car parked next to the estate(M15,21). The best thing to do is to secure the whole area in the first place and then lift up Devitt to transport him.
You can get to the final location in two main ways (M15,20). The first way is down on the vines growing on the main building. This will allow you to climb from behind or on the side of some opponents, with only Isabelle and Cooper allowed to climb on vines as a reminder.
The second way is to use the main entrance to the wagon area. It is guarded by an opponent in a poncho - you can, for example, distract him with a coin or Isabelle's cat, or blind him with Kate's perfume.
Getting rid of opponents in this area shouldn't be very difficult. For most of them, Hector's whistling will work perfectly, though remember not to set up snippets if the character being pulled away is a civilian.
Finally, leave your enemies set up in the immediate vicinity of the car. Opponents from point 1 who stop by the vehicle can be drawn away by whistling, e.g. to the corral. A pair of opponents 2 can be killed with a throwing knife after previously using a combination on them. Get Hector behind the back of the Long Coat 3 and get ready to throw a knife at the opponent 4 - engage Showdown Mode.
After clearing the area or at least getting rid of enemies looking towards the path and the car, move Devitt to the vicinity of the car. The three remaining heroes also arrive to complete the mission.