Rescinding a sale/purchase

Rescinding a sale/purchase: "Does anyone have any legal or practical knowledge about 'rescinding' a sale where fraud was involved; e.g., seller conspired with appraiser to arrive at an over-market value, etc.?

Who would be the first target - the seller, the appraiser, the title company, the lender?

Any experience out there with this?

Any recommendations for good real estate attorneys practicing in Southern CO? "
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