If there’s one thing teenager Jackie Arden is sure of, it’s that her sister, Emelia, is not dead. And if there’s another thing it’s that there’s something very wrong with Grenville Laboratories The mysterious research and development corporation that Emelia was working for when she went missing. After discovering a box of ancient-looking tapes with her sister’s voice recorded in times and places unknown across the multiverse, Jackie makes it her mission to find out where --and when-- Emelia is.