The Missing Postman

The Missing Postman is a journey into the world of Zeb and Zoe and their quest to avenge their (separate) unhappy childhoods. They appear to have created an imaginary world, a world where they become 'Bonnie and Clyde'. They have even aped their heroes and held up several stores in small-town Ireland, and are now holed up in the remote farmhouse of Martin Og, a local hermit.
All is not what it seems however; the more the story unfolds the more we learn about Zeb's invalid mother, Lucy. Was she Martin's lover? Or Harry's, one of their robbery victims? And is one of them Zeb's father?
There is also the mysterious disappearance of Martin's brother, the missing postman of the title. What connection did he have with the one-time vivacious Lucy?