Alex Strand is finding her way as the newest and most ginger member of the University of Berkeley Physics Faculty. But when the murder of reclusive internet billionaire Claire Pope proves insoluble, she's recruited to the top-secret Multiverse Investigations Unit. Hidden in the parking lot of San Francisco Police HQ, the unit investigates murders by sending officers to parallel universes in which the victim is still alive - for now. Alex needs to prove herself. With the help of the mysterious Sarita Jones, the bizarrely-bearded Sergeant Mike Long and Schrödinger the quantum cat, can she track down the murderer, prevent the same crime from happening in a parallel version of San Francisco, and get back before closing time?