The Causeway of Time

Leo Callahan was the only "fatality" of flight 447's crash landing in 2014, yet her body was never found; because she didn't die. Instead, she was dropped into a blank hallway with several different portals into different time periods. With only her backpack, the items in it, and a laptop filled with logs and journals of a person who came before her, she has to figure out why she's in this situation, and, more importantly, how she can get out.