A boy and his loyal dog roam freely and make mischief in a compelling portrait of a spirited family in bygone America.

Born Harold Sylvester George Klein, Little Klein can’t seem to measure up to the "Bigs." His older brothers are a boisterous gang held together by the bustling, bighearted Mother Klein. Try as he might to stand tall and be heard above the din, Harold often feels little and left out — until one day when a stray named LeRoy answers his whistle and the two become inseparable, with LeRoy’s nose leading them from one adventure to the next. Join a cast of colorful characters in a rural river town circa 1949 where boys wrestle and fish, swipe pies, brave perilous waters on homemade rafts — and sometimes quietly become heroes.