This is the fourth installment of the Percy Jackson series, and the most engrossing since the first one. Percy Jackson and his friends try to explore the Labyrinth in order to find the inventor Daedalus and prevent Kronos from controlling the Labyrinth. This book has a lot of the humor of the first three installments, but it does take itself serious at times. A lot of the plot threads like Pan finally come to end. I am glad that the series has not run out of steam, and I wait steadily for the final installment.