The Flicker Effect Series by Melanie Hooyenga

Biz is a perfectly normal teenager except for one minor detail: she uses sunlight to jump back to yesterday. She takes advantage of flickering by retaking Trig tests, fixing fights with her boyfriend (or reliving the making up), and repeating pretty much anything that could be done better. Trouble is, flickering makes her head explode from the inside. Or feel like it anyway. No one knows about her freakish ability and she's content to keep it that way... moreBiz is a perfectly normal teenager except for one minor detail: she uses sunlight to jump back to yesterday. She takes advantage of flickering by retaking Trig tests, fixing fights with her boyfriend (or reliving the making up), and repeating pretty much anything that could be done better. Trouble is, flickering makes her head explode from the inside. Or feel like it anyway. No one knows about her freakish ability and she's content to keep it that way. Guys don't stick around because she refuses to let them in, but all that changes when Cameron, her best friend, starts looking oh-so-yummy. Suddenly she's noticing his biceps, his smile, and the cute way his eyes crinkle when he--gah! This is her friend! But the butterflies come to a screeching halt when little girls start disappearing, then take a nosedive when the police link the kidnappings to Cameron's sister, who vanished years earlier. As the police grasp for clues, Biz photographs a strange man lurking in the shadows and realizes that her flickering can help more than just herself. less

When seventeen-year old Biz wakes up from surgery after helping catch a kidnapper, she thinks she's lost her ability to flicker--travel back in time eighteen hours--but she soon discovers her ability is stronger than ever. And so are the mind-blowing headaches. But flickering isn't the only thing giving Biz headaches... moreWhen seventeen-year old Biz wakes up from surgery after helping catch a kidnapper, she thinks she's lost her ability to flicker--travel back in time eighteen hours--but she soon discovers her ability is stronger than ever. And so are the mind-blowing headaches. But flickering isn't the only thing giving Biz headaches. Her newly shaved head brings out the bullies, her boyfriend Cameron is getting a little too chummy with a girl from the kidnap support group, and Cameron's formerly kidnapped sister is having some serious adjustment issues. When her dad's health takes a turn for the worse, she turns to her neurosurgeon who operated on her. If she tells him the truth, he could figure out why she and her dad flicker and save her before her entire world--and her own health--crumbles. But can Biz trust him with her secret? less

Biz didn’t think life could get worse after the tragic events that surrounded her last flicker, but when she accidentally flickers on her eighteenth birthday after doing shots of vodka—she’s forced to face the consequences of her actions in a way she never imagined. When an anonymous email threatens to reveal her secret, Biz must decide if flickering is all it’s cracked up to be, or if she needs to stop. Forever.