Two years ago, Ben Greenwood's parents walked out the door and never returned. The police have all but given up finding them when Ben stumbles upon a peculiar letter addressed to his dad. “You are the most wanted man in the Unseen Kingdoms. Unless you come to us, we cannot help. For your child's sake, tell us what you know.”

The letter is from an organisation called the Royal Institute of Magic and is dated a day before his parents disappeared. Like most people, fourteen-year-old Ben hasn't the faintest idea what the Royal Institute of Magic is, but he has his first clue: the logo on the letter.

Armed with nothing but his wits and the help of his good friend Charlie, Ben sets out to find the Institute and, through them, his parents. To succeed, he will have to navigate a land filled with fantastic creatures and Spellshooters, where magic can be bought and sold, to unravel an ancient family secret that could hold the key to defeating an evil the Institute has been fighting for the last five hundred years.