When Amos and Angus find out about Gilkin's plans, they pursue him on hus way back to New York, to stop him from spreading ill-fated rumors about the Bullertons at the stock market.
As soon as Amos and Angus learn about Gilkin's plans, they take action by chasing him on his route back to New York, with the goal of stopping him from spreading damaging gossip about the Bullertons in the stock market environment.