As part of your insurance contract, you are likely required to submit to an examination under oath. You are not required to give a recorded statement. Many insurance companies will use an actual attorney to perform the examination under oath. The questions asked by insurance companies in examinations under oath are very intrusive. The company will be looking into your finances, your claims history, all for the purpose of determining, in their mind, if there is a reason for you to have involvement in the fire. I STRONGLY suggest that you bring an attorney with you to the examination under oath. The questions are intrusive and you will feel like a criminal, even if you did nothing wrong. The attorney's presence will give you confidence when the outside counsel starts trying to bully you into answering questions that make you feel uncomfortable. It will also threaten to deny your claim if you do not provide all sorts of materials that you have no real obligation to provide, or if you refuse to answer a question that you deem irrelevant. While everything may go fine, once outside counsel gets involved, it is usually looking for a reason to deny your claim. Don't let them do that to you.
They are brining in outside counsel because they suspect fraud. You should retain an attorney experienced in first-party claims to attend the examination under oath (EUO) with you and to further deal with the insurance co. and its attorney.