After a fire devastates the top floor of a tower block on the Maudling Estate, Maeve Kerrigan and her colleagues are called in. Their presence is needed because it's a sensitive investigation - not because the cause was arson, or because several residents died, but because a body was found in the car park below the tower. It appears that controversial MP Geoff Armstrong, trapped by the fire, jumped to his death. But what was he doing there? The police can't assume that Armstrong was the arsonist's target. As Maeve and Derwent pick through the wreckage, they uncover the secret world of the eleventh floor. It's a tough investigation, made harder by Maeve's private life unravelling.