When I Was Alice - Jennifer Murgia - Bog

"To make a wish for her brother's recovery, Grace Brighton climbs the Hollywood Sign, loses her footing and plummets--only there is no impact. Instead, she finds herself the center of attention at a film studio ... in 1953. She's mistaken for Alice Montgomery, who mysteriously disappeared just days before. Grace must piece together Alice's life and find out who wants her dead to have any chance to return to her own time--alive"--