I live in California and located a hard-to-find used car in Houston TX. I phoned the seller and extended him a verbal offer which he accepted, also verbal. After having the car inspected I asked the seller to confirm our contract via email prior to wiring the check. He emailed the following "Yes, the terms are as you describe - upon receipt of full payment of $24,000 and clearance of whatever form of payment it takes, I'll sell you, as is, with all faults, my C55 with VIN Number XXXXXXXXXX". He sent that Saturday 3/5. On Sunday 3/6 he emailed me saying he decided to keep the car. Practically speaking, can I take action to compel him to make the sale? Would I need an attorney to do that?