Easy as Falling off the Face of the Earth by Lynn Rae Perkins

On his way to summer camp in Montana, fifteen-year-old Ry opens a letter and discovers that the camp has gone out of business; when he hops off the train to try to call his grandfather, the train leaves without him, stranding him in the middle of nowhere. A lot happens in the novel. Parents, grandfathers, dogs go MIA. (The dogs' adventures are illustrated in humorous cartoon drawings.) A kind stranger who "marches to the beat of, like, I don't know, a harmonica or something" offers to shepherd Ry home to Wisconsin and winds up taking him to the Caribbean.

Ry travels by train...
Car...
Plane...
Boat...
And Feet...
Will he ever find his parents, grandfather and dogs?

book trailer