A Monster Calls is a deeply moving and emotional story of a boy named Conor, whose mother is ill and there's nothing he can do about it. But that's not what's in this book, no. While Conor's still trying to cope with his mother's illness and bullying in his school, there's a monster outside of his house who might or might not be an imagination. You don't know if the monster is actually a monster, or it's just a dream Conor is having. But that doesn't scare him, because has had far more horrifying nightmare which he can never forget.