Luke Taylor and Trevor Lane / Lowell F. Volk.
(Book)

Join Luke and Trevor as their adventures continue. They fight outlaws and Indians while heading west. After reaching Independence, Luke and Trevor join a wagon train. On this wagon train the two boys discover old friends are traveling with them. The Wrights are relatives of an old friend who had saved Trevor's life earlier during the war. The Dailys had met Luke when he was in St Louis and were on the train with them. All of their old friends welcome each other and recount good times from the past on the wagon train. But not everyone is glad to see Luke and Trevor. Two men, who used to be part of Captain Fry's gang, are also on board. Will Luke and Trevor discover who these mysterious men are before they exact their revenge? Why are these two even on the train in the first place?