The last time Maureen O'Donnell saw Ann Harris, she was staying in the Glasgow Women's Shelter, drunk and with two broken ribs. A month later, Ann's mutilated body is washed up on the banks of the Thames.

No one seems to care what happened to her, and Maureen is the only person who thinks Ann's husband is innocent. With her personal life in turmoil, she runs away to London and starts to piece together Ann's final days. But time is not on her side. Maureen needs twelve hours to put things right, and she doesn't care what it costs.