M54-108 : Strider meets Mr. Underhill

Strider, a Bree nickname for Aragorn, was a friend of Gandalf the Grey and was charged by Gandalf to meet Frodo Baggins in Bree, if Gandalf was detained, which indeed he was in Isengard by Saruman. Strider was to guide and protect the Hobbits to their next destination, the Elven realm of Rivendell, so they could meet with Elrond and formally form the Fellowship of the Ring. He had to protect them from the pursuing Black Riders, who only really knew the name “Baggins” from the Shire as that name was all Gollum screamed when tortured by Sauron’s agents about the likely holder of the One Ring. Thus “Mr Underhill” was used instead if Frodo had to identify himself.