Shift by Jennifer Bradbury

You are about ready to graduate from high school, you are off to a great college in the fall and you have just convinced your parent you and your best friend Win should ride your bikes cross country from the east coast to Seattle’s west coast. For Chris this is the trip of a lifetime. Things start out great. The weather is beautiful; you meet and have interesting conversations with people. You even find people who offer you a warm place to sleep and a hot meal. But you and Win have a disagreement and the next thing you know Win disappears. You just think he decides to go it on his own, but when you return home and go off to college, the FBI comes asking questions. Win is still missing. Will you be a suspect in his disappearance?
This is a great mystery, real to life and a compelling read.