"A lavish, cleverly plotted mystery in which an unforgettable heroine finds herself trapped in the past, from international bestselling author Elly Griffiths. Meet Ali Dawson: a police officer working on crimes so old, the joke goes, that they are not only cold but frozen. The team's office is in a grimy part of the city, yet Ali's work seems like a safe desk job. But what her friends--and even her beloved son--don't know is that the cold case team has a secret: they can travel back in time to look for evidence. So far, Ali has only made short trips to the recent past, so she's surprised when she's asked to investigate a murder in 1850. The killing has been pinned on an aristocratic patron of the arts and antiquities, and member of a sinister group called The Collectors. She arrives in the Victorian era during a mini ice age to find another dead woman at her feet and far too many unanswered questions. But when her son is arrested, Ali attempts to return home only to find herself trapped in 1850. In a race through and against time, can Ali prove her son's innocence and discover the link between the nineteenth-century Collectors and a twenty-first century killing in time to prevent another death? Some murders can't be solved in just one lifetime"--