Betty Foster (Margaret O'Brien), a high school student, has a crush on Bobby Evans (Allen Martin Jr.), who is more interested in sports than girls. Betty and her kid brother,Herbie (Jimmy Hunt), follow Bobby and Lucille Stewart (Elinor Donahue), Betty's competitor in the pursuit of Bobby. Betty's efforts to have Bobby crowned King of the Camp, and win his lover, almost ruin her father, Joe Foster (Arthur Space), financially.