After being transported back in time, a social worker meets a police officer who helps to investigate her sister's murder case, and possibly prevent it from ever happening. The trail of clues, however, leads to further unsolved cases that force them to question their motives for altering the past.

In 2012, Lin Hsin-Yu's big sister was murdered. With no witnesses, a lack of evidence, and no obvious suspects, the case was never solved. Twelve years later, during an atmospheric phenomenon called a parhelion, an office-building elevator transports Hsin-Yu, now a social worker, back in time to 2012. There she meets police officer Chang Yen, who also lost a beloved sibling. While Hsin-Yu's sister was murdered, Chang Yen's brother killed himself after being framed for a crime. The two begin working together, not just to seek justice for their departed siblings, but to see if they can change the past entirely!

Soon, however, other cold cases emerge: a missing girl, a battered wife, victims of sexual abuse at the hands of a religious cult. As Hsin-Yu and Chang Yen follow the trail of clues deeper, they begin to think that all of the cases might be linked. Altering one will have implications for all of the others. In that case, could changing the past have undesirable consequences? What if the past, despite its tragedies, was already the best possible outcome?

Starting with the understandable urge to right the wrongs of the past, Parhelion gradually guides readers into more philosophical terrain. Within the framework of a mystery/suspense novel, author Fourone poses questions about the structure of time, our relationship to the past, and the acceptance of loss. Lovers of contemporary fantasy and suspense will follow the unfolding mystery with relish, but the heartfelt questions and welcome doses of warmth and healing that are sure to satisfy readers of any stripe.