You will need/want to make a claim against the CPA's error and omissions insurance (E&O Insurance). Since CPA's are regulated, you should be able to find the information with a little digging around.
However, when it comes to tax returns, it can be difficult to prove the CPA was at fault since the information that goes into the tax return is supplied by the taxpayer.
In any event, best of luck.
You might also want to request a penalty abatement from the IRS. Sometimes the IRS is sympathetic when a taxpayer has relied on the expertise of an accountant and will grant a penalty abatement request.
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