Photo: KATU
It's been nine years since Kyron Horman went missing at Northwest Portland's Skyline School.
On Tuesday, Desiree Young, Kyron's mother, held a news conference to announce that New York Times best selling true crimes author Rebecca Morris is writing a book about the case.
Proceeds from the book, titled "Love You Forever, The Search For Kyron Horman" will go to a missing children program.
Young says the more she remembered about how the case developed the more she believes Kyron's step-mother Terri Moulton is involved in his disappearance.
Investigators have never named a person of interest or a suspect in the case.
Moulton dropped off Kyron at school the day he went missing.
Young says detectives have narrowed the search area to around 100 acres.
Young continues to urge Moulton to cooperate with investigators.