By Josh McDowell. This book is an unparalleled defense of Christianity. Simply put: there's nothing else like it on the market today that so powerfully provides scholarly, intelligent, and well-grounded answers. Josh does a fabulous job with all 12 chapters that any high schooler can read and understand.
You will especially love chapter seven where he talks about "Jesus: Lord, Liar or Lunatic!" This edition has a User's Guide at the beginning that is most helpful. There are more than one million copies in print. It is a "must have" book if you want to know how to share your faith with non-believers. It will stimulate and challenge the reader as well as the one who receives the witness.