The illustration itself tells the story and it is not necessary for Sherlock Holmes to tell us that the boys have found an old toolbox in the shed that their mother is not at home since she has attended a meeting and that it should be Thursday that It is the day the maid pounds.
There are other interesting aspects, such as how Towser is going out through the door once the boys have nailed the side of the house. That, however, is a problem that Towser will have to solve in his own way, so we will not waste any more time and devote ourselves to the riddle approach.
What is the best way to cut the square top of the kitchen table in the smallest possible number of pieces that fit to close the open side of the house?
The young carpenters cut the top of the table as shown in the following figure, which only required two cuts: