The Mountain Lion - Faber Editions by Jean Stafford

Ralph and Molly are inseparable siblings: united against the stupidity of daily routines, their prim mother and prissy older sisters, the world of adult authority. One summer, they are sent from their childhood home in suburban Los Angeles to their uncle's Colorado mountain ranch, where they write, hunt, roam. But this untamed wilderness soon becomes tainted by dark stirrings of sexual desire - and as the pressures of growing up drive an irrevocable rift between them, their innocent childhoods hurtle towards a devastating end . . .