Answer
The answer is as follows. 
Katrielle and the Millionaires' Conspiracy walkthrough
Puzzle Location: Lipski's pâtisserie (Lipski brothers)
Can you find your way through the maze?
To get from the starting point at the bottom-left to the goal at the top-right, you need to break through one section of wall.
Slide the circle over the section of wall that you think needs to be destroyed.
Follow the paths from both the starting point and the goal to find the right wall.
There is only one wall linking the starting point and the goal.
The left side of the goal area looks promising.
The top-right part of the starting point area looks like it might join up with the goal area.
If you shade the areas near the starting point and the goal area, you can quickly see which wall needs to be destroyed.
The answer is as follows.