Iowa Code § 802.5

If the periods prescribed in sections 802.3 and 802.4 have expired, prosecution may nevertheless be commenced for any offense a material element of which is either fraud or a breach of fiduciary obligation within one year after discovery of the offense by an aggrieved party or by a person who has legal duty to represent an aggrieved party and who is not a party to the offense, but in no case shall this provision extend the period of limitation otherwise applicable by more than three years.