Emma is a single mother, with two boys, Jacob and Theo.
Jacob has Asperger's, so is definitely not your typical 18 year old. His social skills are minimal, and he gets distressed by changes to routine, physical contact, and the colour orange. He is totally obsessed with all things forensic, even having a make shift fuming chamber in his bedroom so he can check for fingerprints. His obsession extends to disappearing in the middle of the night so he can attend real life crime scenes, and give advice to the experts at the scene.
There are some amusing misunderstandings, as Jacob takes everything very literally, and also some very poignant scenes when Jacob freaks out uncontrollably and Emma has to resort to unusual tactics to get him back to his more normal behaviour.
Emma is stretched to her limits, both emotionally and financially, trying to make sure that Jacob lives as normal a life as possible. Her world is effectively ruled by what state Jacob is in at the time; she does not have the resources to take time for herself, nor for Theo.
Theo feels that his life has been messed up by his older brother, who gets all Emma's attention, and he is becoming jealous and rebellious.
Jacob's passion for crime scenes eventually gets him into trouble - it would spoil the story to say more.
Fascinating, a must read!