Stop, Thief!

Stop, Thief! is a Main Story Quest in Xenoblade Chronicles 2. It is received at the port in Grodd Residential Zone in Torigoth, Gormott Province, after Roc's Core Crystal gets stolen and the party gives chase to the thief

Quest objectives

 * Ask around and see what information you can scrounge up about the young thief in the vicinity of the Torigoth port.
 * Nugby must be talked to to progress the quest.
 * Go to Nocclia Timber Site in Gormott and ask Otto about the boy.
 * Search for footprints the boy may have left behind at Nocclia Timber Site in Gormott.
 * Either clear the Keen Eye and Fortitude level 1 check or ask Otto.
 * Follow the boy's footsteps, which lead away from Nocclia Timber Site, and try to determine his whereabouts.

Results
"It seems the young thief's destination was Umon's Shipyard. Close in and scope out the situation."