It's often what is unseen at a house inspection that will cost you the most. Structural damage in older houses is quite common, from termite damage to the failing of inadequately fastened timber that is under a load, like this strut holding a beam that supports the rafter loads. From above looking at the tiled roof, there was a slight deflection in the tile line. But seen from below, you can see the cause of the issue. This particular house had 3 cracked and broken rafters, as the rafters had failed due to the extra load placed on them by the strutting beam failure. This is quite a repair, but can be fixed if you are willing to spend the money and really want the house.