The Tempus Imperium

When Charlie's grandmother is killed, she is plunged into the world of the Temporal Sinistrum. An organisation of time travellers that maintain the historical timeline. Her grandmother used to be a star agent and Charlie must solve her murder, in an adventure that takes her from 1966 Australia to a post-apocalyptic Los Angeles. This is a coming-of-age story that spans centuries as Charlie investigates the Sinistrum, while still dealing with her feelings for the boyfriend she left behind.