Mickey, Minnie, and Pluto go to Lake Tranquil to take summer jobs, only to find that the tourist trade is being scared off by a ferocious seven-colored mountain lion.
Mickey laughs at Minnie's new hat, then mistakes a girl in a similar hat for Minnie. The girl mistakes Mickey for someone else and gives him a "diamond ring" that actually contains a large ruby. Minnie is kidnapped by the girl's real contact, Black Pete (who is never identified by name.)