Caroline B. Cooney's Janie books launched way back in 1990, and have come out every few years until 2013. The first four books in the series were reprinted in 2013 to celebrate the publication of the final book.

The Janie Books Series Info

• Series Title: The Janie Books, or The Janie Johnson Series
• Author: Caroline B. Cooney
• Publisher: Ember (Random House)
• Number of Books: 5 novels + 1 short

Series Synopsis

Janie Johnson thinks she's just an ordinary teen, until one day at lunch she recognizes the little girl on the back of a friend's milk carton.

Under the phrase "Missing" is a twelve-year-old photograph of Jennie Spring, at age three, kidnapped years before, but still being searched for. Janie knows the little girl, because the little girl is Janie.

So begins Janie's tale. The series follows her as she tries to cope with the news that her loving parents aren't really her parents, and that her biological family still wants her back. She now has two families, and has to learn to balance them, and she has to figure out her own identity. Is she Janie, the girl she always believed herself to be? Or is she Jennie, a girl who was stolen from her true parents years ago?

As if being a teenager and suddenly gaining an extra family -- and having everything you thought was true cast into doubt -- wasn't enough, there's also the FBI. The Feds naturally want to find out who kidnapped Janie in the first place and bring that person to justice. Understandably, the kidnapper doesn't want to be found out, and may resort to drastic measures to stay hidden.

Major Characters

• Janie Johnson: The series' main character. Janie thought she was just an ordinary girl until she saw a picture of herself, taken as a child, on the "missing" ad on the back of a milk carton.
• Jennie Spring: The little girl whose image is on the milk carton. She was kidnapped twelve years before the series opens, when she was three. Jennie Spring is Janie Johnson.
• Mr. and Mrs. Johnson: Janie's adoptive parents, a loving couple who may actually have kidnapped her as a child.
• Mr. and Mrs. Spring: Janie/Jennie's biological parents, from whom she was stolen twelve years before the first book.
• Reeve Shields: Janie's high school boyfriend. He's a bit older, and goes off to college before she does.
• Hannah Johnson: The deceased daughter of Mr and Mrs Johnson.

The Books

• The Face on the Milk Carton (book 1)
  ISBN: 978-0-385-32328-4 (hc), 978-0-385-74238-2 (pb), 978-0-307-56750-5 (e-book)
  An IRA-CBC Children's Choice book
  Fifteen-year-old Janie Johnson is a typical teenager, with the usual issues with school and friends, but lucky enough to have loving parents. Except when she sees her own face in the "missing" photograph on the back of a milk carton, she realizes something more is wrong than just the typical teen problems. Could she have been kidnapped as a child?
  

• Whatever Happened to Janie? (book 2)
  ISBN: 978-0-385-31035-2 (hc), 978-0-385-74239-9 (pb), 978-0-307-42520-1 (e-book)
  A YALSA Best Book for Young Adults
  Janie/Jennie has returned to her biological family and has to adjust to new parents and new siblings. Everyone is trying hard to help her fit in, but she misses her adoptive parents. It doesn't help matters when the FBI steps in to sort out what happened all those years ago.
  

• The Voice on the Radio (book 3)
  ISBN: 978-0-385-32213-3 (hc), 978-0-385-74240-5 (pb), 978-0-375-89207-3 (e-book)
  A YALSA Best Book for Young Adults
  Janie's boyfriend Reeve has gone off to college, where he lands a show on the college radio. He chooses to tell the story of Janie's kidnapping as part of his show, which leads to a series of events that causes Janie to break up with Reeve.
  

• What Janie Found (book 4)
  ISBN: 978-0-385-32611-7 (hc), 978-0-385-74241-2 (pb), 978-0-375-89208-0 (e-book)
  Just when Janie is finding peace with her life, and balancing her adoptive and birth families, her adoptive father has a stroke. Her adoptive mother can't cope, so Janie takes over the family's financial and business matters. She finds something among her father's papers that may destroy the peace she and her two families have finally found.
  

• What Janie Saw (short)
  ISBN: 978-0-375-97998-9 (e-book)
  Janie's adoptive -- and supposedly deceased -- sister Hannah has her say in this e-book-only tale that ties the first four books into the final volume.

• Janie Face to Face (book 5)
  ISBN: 978-0-385-74206-1 (hc), 978-0-375-97997-2 (e-book)
  A true crime writer starts contacting Janie's friends, trying to find out the truth about her past so he can discover the identity of her kidnapper. But his meddling is making the kidnapper nervous, and may drive him to action, putting Janie and everyone she loves into danger.