After a three-week photo assignment chasing wild mustangs in the heat of South Dakota, Kate Ryan wants nothing more than a quiet week at her log cabin in the woods. She decides it should be 'girls only' and invites her sister Teri, Aunt Hannah, and Maggie.
Her nice quiet week turns out to be anything but. The trouble is, Maggie brings a friend along, and Kate is more reluctant to acknowledge any feelings she might have for Maggie. However, Kate finds a champion in Aunt Hannah, who is determined to see her sarcastic niece and the elusive Kate together at last.
Yet, something more troublesome is happening on the lake: a violent storm that leaves them isolated; a body washes up on the beach; too many suspects and no way out - that's the trouble with murder.