Right now I am reading the Percy Jackson series.
Percy Jackson And The Battle Of The Labyrinth is number 4 in the series and its about Kronos who is the bad person wants to attack camp half blood a summer camp for half bloods (half god half human). Then Percy finds a Labyrinth entrance in the camp which Kronos could attack through. But there is an older half blood helping with sword training who Percy finds suspicious. So himself, Annabeth, Grover and his little brother Tyson go into the labyrinth to find Daedalus to ask him not to give Kronos the directions of the labyrinth. Daedalus is the creator of the labyrinth so they can’t let Kronos get hold of him.
I highly recommend you read it.