Demon in the Mirror by Lovelyn Bettison

When Janet Tate starts seeing evil spirits in her bathroom mirror, she calls on Suncoast Paranormal. Can Cheryl and Adam close the portal to hell in Janet's home before it's too late?

Adam and Cheryl start investigating the disturbances in the Tate home only to find a gate to another dimension. Demonic spirits are trying to cross over into the mortal world to overtake humanity. Only Adam and Cheryl can stop them, but first, they must figure out how.

But Cheryl is distracted by another ghost steadily pumping disco music into her head. The only way she'll find peace is to help him, but he won't speak to her. Instead, he shows her the same scene again and again.

Adam is susceptible to the tricks of the lead demon who wields power over him. He is unable to escape the demon's clutches on his own.

Will Cheryl get the music out of her head in time to prevent a terrible situation from becoming worse? Will Adam be able to resist the pull the demon has on him? Will they figure out what to do before it's too late for all of humanity?