In this second book in the Time Benders series, the full impact of what Joe has done sinks in, angering Deb and Ken, and causing Ken to say no more to the time machine. Later, when Deb learns about Mr. Brewster's history, she and Joe defy Ken and take the machine to Las Vegas, 1958 to keep Mrs. Brewster from a certain accident. Bolstered by the success of this trip, Deb decides recklessly to try to undo what Joe had done in his solo trip last year, by returning to Cambridge to stop Joe. The unknown forces of the universe and energy are working against their efforts to be in the same space and time and she barely makes it back alive! All of this creates a rift between Deb and her best friend Mary, because of the spiritual questions of whether one should try to change someone's fate, until she finally understands, when she learns she may face a terrible future and major illness. Mary convinces the Fitzgerald siblings to use the machine to go forward in time to find out her fate. Through all of this, the siblings commit to two major promises about the machine, and their parents, and wrestle with their faith. They struggle with the questions presented by time travel, the loss of their parents, and the fact that their trips continue to wreak havoc on their memories. Along the way, their relationships with their siblings, friends, girlfriends and boyfriends are tested. This heartwarming story packs a punch of history, faith, and science, sprinkled with kindness through these relatable teens.