A new series from the author of the Dr Ruth Galloway Mysteries. Ali Dawson is a police officer working on old crimes. Using a process pioneered by a mysterious Italian physicist, her team are able to travel back in time. Ali travels back to London in 1850. Soon she finds herself in extreme danger. Even worse - she appears to be stuck, unable to make her way back to the present, to her life and to her son, Finn. In conversation with Catherine Larner