Homir Munn (Second Foundation) is a librarian and owns one of the biggest collections of information about the Mule.
Munn is one of a group of conspirators who plan to find the location of the Second Foundation. Together with Toran Darell II, Pelleas Anthor, Jole Turbor, Dr. Elvett Semic they set about piecing together the evidence.
He agrees to go on a mission to Kalgan to find information about the second foundation from the Mule's palace. Arkady Darell, then 14, decides to be a stowaway on the flight, to take part in the adventure. Munn discovers her presence mid-trip. However she quickly persuades him that it is a good idea to have her along, and likewise persuades her father too, that her presence makes the whole trip appear more natural.
When at Kalgan, Munn, with Arkady's help, manages to persuade Lord Stettin to allow him access to the Mules palace for research purposes. Subsequently he unwittingly causes a war with the Foundation at Terminus, although the real cause is a combination of Arkady's machinations reinforced by Lady Callia.
He discovers the magnitude of the Mule's search for the Second Foundation and after the war finishes, returns to Terminus, convinced that the Second Foundation never existed. A mental analysis reveals that he has been manipulated by Callia into believing so.
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