Settlement cracks concealed by sellers

Is recourse possible or are buyers stuck with repairs?

DEAR BARRY: Since purchasing our home, numerous cracks have appeared in the walls. Some are as wide as half an inch. We’ve also noticed that patching has been done at many of these cracks, indicating that the sellers of the home were aware of the problem but had attempted to hide it. None of this was reported by our home inspector when we were in escrow. How serious do you think this problem is, and what should we do about it? –Thomas