If I am a signer on a company account, am I liable for all transactions?

I'm pretty sure my boss is a very slick scam artist. I'm no forensic accountant by any means, but it's pretty apparant that something is going on and I am simply a pawn who is helping someone get rich. I mean, why would someone pay $11,000 a month for long distance when they could get it for free? Anyway, my boss is telling me that he wants me to become a signer on one of the accounts because the company we need to pay isn't supposed to know that my boss owns the company. I'm concerned about the liability that may come in to play if this occurs. What if something happens and we are sued or audited, would I be liable for the transactions of the company? I'm just a bookkeeper. I'm not an accountant. I'm just trying to do my job. I'm an honest person. Should I agree to be a signer on the account when I only partially knowing the reason it is being done?