All That Impossible Space by Anna Morgan

15-year-old Lara Laylor feels like supporting character in her own life. She’s Ashley’s best friend, she’s Hannah’s sister-she’s never just Lara.

When new history teacher Mr. Grant gives her an unusual assignment: investigating the mystery of the Somerton Man. Found dead in on an Adelaide beach in 1948, a half-smoked cigarette still in his mouth and the labels cut out of his clothes, the Somerton Man has intrigued people for years. Was he a spy? A criminal? Year 10 has plenty of mysteries of its own: boys, drama queen friends, and enigmatic new students. When they seem just as unsolvable as a 60-year-old cold case, Lara finds herself spending more and more time on the assignment.