The investigation of the murder of Walter Paxton's wife continues, as it is now determined that a serial killer is on the loose. While helping Devalos and Scanlon with the case, Allison discovers that her new friend Debra is the next victim. Allison goes to great lengths to protect Debra, but is shocked to find that her new friend isn't who she thought she was. Meanwhile, Joe debates being part of a lawsuit against Aerodytech, the company he's been loyal to for years.

In the third season finale, Allison's life, along with the lives of her family, is uprooted as her psychic abilities are revealed to the public. Allison must now find a way to catch the "recapitator" serial killer on her own, as she can no longer turn to Devalos or Scanlon for help.

Now that Allison's special abilities have been revealed to the public, everyone's lives have been turned upside down. Allison starts to have dreams about a boy who was kidnapped from a toy store, but is unable to turn to Devalos or Scanlon for help. She decides to call the company hired by the missing boy's family and makes an unusual deal with the company's investigator, Cynthia Keener.

Larry Watt, a defense attorney who has caused trouble in Allison's past, asks Allison to be a consultant for him. Low on money, Allison accepts his offer. She later has a dream that his client murdered his wife.

Joe's mother pays a surprise visit, which worries Allison because she hasn't seen her since her psychic abilities became public knowledge. Meanwhile, Cynthia Keener tries to push Allison's dreams towards outstanding cases and Devalos and Scanlon are reunited with Allison in an unexpected way after an arson-related murder.

Allison tries to find the link between Ariel's prediction of a classmate's mother's death, dreams related to her case with Cynthia, and Devalos' murder case. She also must try to keep her mother-in-law Marjorie's secret hidden from Joe.

As Allison teams up with Scanlon to track down the dangerous "cougar" they believe is responsible for the murders of young men, she also has visions that Devalos' campaign is in jeopardy, with someone plotting against him.

When Joe presents his new solar power-based invention to an investment firm, he piques the interest of venture capitalist Meghan Doyle. Meanwhile, FBI profiler agent Edward Cooper claims his return to Phoenix is to track down another serial killer, but Allison's dreams tell her otherwise.

Allison has visions of a friend of Scanlon and Lynn DiNovi dying in a home mishap. This causes her to struggle with connecting some recent "accidental" deaths, consequently putting her own health in jeopardy.

In the fourth season finale, Allison tries to help a young couple who thinks their house is haunted, but her efforts result in murder. Meanwhile, Meghan Doyle tries to sell her controlling interest in Joe's invention and Joe tries to save his own stake in it. Also, the election between Devalos and Tom Van Dyke takes place.