As a child Sandie is plagued by nightmare where she is chased by an evil black dog until her Mum gets her a real dog to lie under her bed and "chase" the nightmares away. Sandie grows up to be a police woman and after her dog dies, the nightmares return. One night, chasing a shooter to the roof of a building, the black dog appears again ......for real. A story about depression and the power of mental illness. The book says :Not for younger readers" but Year 7s and 8s would be fine with the subject matter, even the descriptions of the shooter's victims and the shooter's descent into madness as he is overcome by his depression/the black dog. Printed on sepia paper with dyslexic friendly font. Illustrated with quite dark images. ( )