Jericho Jones

From the introduction:

Rocko, a small-time fixer known to one party member, contacts the party with a "favor" to ask. He has a client, Malachi Jones, who needs to have his son returned to him. To emphasize the "favor" appeal, make one of the characters, preferably a nomad, somehow owe a favor to Malachi Jones. If the characters are stupid enough to do this as a "favor", Rocko pockets a big wad of cash. If the characters are smart, Rocko makes them the real offer. His client offers 10,000 eb for the return of Jericho Jones, the son of Malachi Jones, the chief of the Jones Tribe. Jericho is hiding out in Sky Mesa, with the tribe of nomads living in the area.