Percy Jackson and Camp No Blood Book3 The Song of Dreams
This is the plot to the next book in the series spoiler warning for those who don't want to know want it's about yet.
It is five days before Percy goes to Camp No Blood. In New York he comes across a shop he has never seen before. It's an instrument store and Percy enters and picks up a guitar which is the first thing he sees. He hits one string and everyone around him falls asleep. Percy is amazed and leaves money next to the sleeping cashier. He gets to camp and finds there are three new kids there this year. Ricky, Mitchell, and Jasmine. He makes friends with both Ricky and Jasmine and becomes enemies with Mitchell. Days later Percy's guitar is stolen so he goes to find out who took it. A few days later he is watching television in a nearby restaurant and he sees that almost all of New Jersey has fallen into a deep sleep unable to wake up. Now it's up to Percy, Ricky, Jasmine, and Annabeth to find the culprit and stop him before he puts the entire world to sleep.