Elsewhere, Imogen shows Mark the photograph of Aaron at the school and Mark fears that his brother may be guilty of lighting the fire. Reluctant to confront him, Paige suggests that Mark should approach Aaron as a brother first and a policeman second. Mark takes this approach and Aaron confesses that he bought some "hot" fertiliser and was unable to take it home, so he stored it at the school.
Mark loses his cool, informing Aaron that the fertiliser was the main accelerant in the fire and caused the explosions. Mark asks Imogen to keep the photo of Aaron under wraps until he can carry out further investigations. However, while Mark is willing to bend the law to protect his brother, Aaron chooses to handle the situation in a very different way.