Natalia Dyer is in final negotiations to join the cast of Giorgio Serafini’s supernatural thriller “The Healer.”Joel Courtney (“Super 8″) and Isabelle Fuhrman (“Orphan”) star as teenage twins who go on a camping trip with their ailing father (James Le Gros), only to become lost in a haunted forest. Dyer will play a mysterious being sent to protect Courtney’s character from the various creatures that are out to destroy him. Serafini wrote the indie pic, which Giuseppe Pedersoli and Susan Johnson are producing through the former’s Italy-based Smile Prods. banner. Production starts next week in North Carolina. Dyer will soon be seen in a breakout role as the lead in Leah Meyerhoff’s “Unicorns,” a coming-of-age story about an awkward teenage girl who escapes to a fantasy world when her first romantic relationship turns increasingly violent. Heather Rae (“Frozen River”) and Mark Mathis (“Precious”) produced the indie pic, which was a Sundance Lab finalist and IFP grant winner. Dyer is repped by manager Christopher Rockwell and attorney Marcy Morris.