Ernest Cline - Ready Player One

In the year 2045, reality is an ugly place. The only time Wade Watts really feels alive is when he's jacked into the OASIS, a vast virtual world where most of humanity spends their days. When the eccentric creator of the OASIS dies, he leaves behind a series of fiendish puzzles, based on his obsession with the pop culture of decades past. Whoever is first to solve them will inherit his vast fortune - and control of the OASIS itself. Then Wade cracks the first clue. Suddenly he's beset by rivals who'll kill to take this prize. The race is on - and the only way to survive is to win.