The After Effects is the fourth novel in the Welcome to Keystone series. The book takes place over the weeks following Keystone's Election Day on which arrogant and wealthy Lucifer Riches was inexplicably named Mayor of Keystone. Summary from the back cover: Shocked and confused by the results of the election, Dennis Lawrence enlists the help of Larry Pinto and various family friends in search of the truth behind the results. Will the truth be uncovered, or will Lucifer Riches continue to reign as mayor? Meanwhile, Lucifer and his family enjoy the perks of his new position along with the citizens' reactions to the outrageous new policies that he has decided to inflict on the town. But could a bit of carelessness and overconfidence cut his victory party short? While his family is enjoying his uncle's victory, Gerard Riches frets over some accidentally discovered information about the election as well as the changes that have taken place in his classroom. Will Gerard choose to reveal what he knows for the sake of his classmates, or will fear force him to keep quiet? Finally, war is brewing between Bridget Hadly and Rosalind Sharlin as Bridget fights to regain the life she once had before Rosalind became her stepsister. Will Bridget's antics drive Rosalind away, or will she be forced to accept that Rosalind is here to stay?