Four teenage friends facing a summer in which they will all be separated for the first time. On a shopping trip, the girls find a pair of thrift-shop jeans that fits each of them perfectly and they decide to use these "magic" pants as a way of keeping in touch over the months ahead, each girl wearing the jeans for a week to see what luck they bring her before sending them on to the next. Though miles apart, the four friends still experience life, love and loss together in a summer they'll never forget.