Hunt for Gollum

The Hunt for Gollum was commissioned by Gandalf.
Just as Gandalf was finding out more about the Ring, he immediately sought Gollum for answers with the assistance of Aragorn. However,  the enemy had gotten to Gollum first and tortured him into revealing where the Ring was, and gave them two clues: "Shire" and "Baggins." Realizing Frodo was in danger now and uncertain if he had the Ring, Gandalf returned to Frodo, who learned of the hunt for Gollum by Gandalf when Frodo's ring is the One Ring.