This book is, at it's center, a story of the bombing of Hamburg. When Tom and Iris find Martin, Iris is interested only in making sure he is arrested as soon as possible. However, when a bomb siren goes off, her plans are set aside and she and her younger brother shelter with the young German.
At first, she feels no regard for Martin, dismissing his losses as what he deserves for being German, but as he begins to tell his tale to pass time, Tom and Iris are drawn into the horrors of what this teenage German has experienced.
Iris soon begins to realise that Martin is right - the horrors of war do not care who you are, or what side you are on. A bomb will just as soon kill an elderly couple as it will a soldier.
This book also takes a rare angle, and looks at the events that lead Martin on his road to bombing Tom and Iris' home town. If you ever thought it was simple evil, you were wrong. Martins tale is of bravery in the face of danger, love for his family, and trust in his friends.
The descriptions are graphic in places, and this book cannot fail to bring you to tears. The entire story is a powerfully touching tale that will have you thinking about it for weeks afterwards, and will emphasise the wastefulness of war to anyone that may not already realise it.
Everyone should read this book at least once in their lifetime.