I just informed my two boys (16 and 12) that screen time for ALL of us is limited to 2 hours a day. I love to read, as does the 12 year old (who is homeschooled). The 16 year old hates it but really needs to do it. I am going to hand him a copy of The Hound of the Baskervilles, which the 12 year old loved.
Said 16 year old goes to private school and while his school doesn’t require any specific summer reading (!!), the others around here do. Rising sophomores are required to read Fahrenheit 451, The Catcher in the Rye, and The Curious Incident of the Dog in the Night time. I have all three for him on hold from the library.
A great book for a 12-year-old, maybe some who are older: ‘My Side of the Mountain’, Jean Craighead George. If they like it, there are two other books in the trilogy:
https://www.amazon.com/Side-Mountain-Jean-Craighead-George/dp/0141312424