Think diagonal.
Vertical cracks in the interior walls are not usually a sign of structural failure unless they are obviously wider at one end than the other. Your concrete foundation may be OK.
Vertical cracks in the interior walls may be unattractive and honey-do worthy, but are not usually an indication of structural failure unless they are obviously wider at one end than the other. On the other hand, diagonal cracks, especially in the exterior brickwork, are not a happy sign.