Cambridge is sweltering, during an unusually hot summer. To Jackson Brodie, former police inspector turned private investigator, the world consists of one accounting sheet--"lost" on the left, "found" on the right--and the two never seem to balance. Jackson has never felt at home in Cambridge and has a failed marriage to prove it.

In rural Devon, six-year-old Joanna Mason witnesses an appalling crime. Thirty years later the man convicted of the crime is released from prison. In Edinburgh, sixteen-year-old Reggie works as a nanny for a G.P. But Dr Hunter has gone missing and Reggie seems to be the only person who is worried. Across town, Detective Chief Inspector Louise Monroe is also looking for a missing person, unaware that hurtling towards her is an old friend, Jackson Brodie, himself on a journey that becomes fatally interrupted.

Jackson Brodie has relocated to a quiet seaside village in North Yorkshire, in the occasional company of his recalcitrant teenage son Nathan and ageing Labrador Dido, both at the discretion of his former partner Julia. It’s a picturesque setting, but there’s something darker lurking behind the scenes. Jackson’s current job, gathering proof of an unfaithful husband for his suspicious wife, seems straightforward, but a chance encounter with a desperate man on a crumbling cliff leads him into a sinister network - and back into the path of someone from his past. 

It's a day like any other for security chief Tracy Waterhouse, until she makes a purchase she hadn't bargained for. One moment of madness is all it takes for Tracy's humdrum world to be turned upside down, the tedium of everyday life replaced by fear and danger at every turn.

On a hot summer day, Joanna Mason's family slowly wanders home along a country lane. A moment later, Joanna's life is changed forever....On a dark night 30 years later, ex-detective Jackson Brodie finds himself on a train that is both crowded and late. Lost in his thoughts, he suddenly hears a shocking sound.