In “End of Sentence,” director Elfar Adalsteins presents a poignant film centered around Frank (John Hawkes), a man recently bereaved. Shortly before her death from cancer, Anna (Andrea Irvine) asks her husband to take their son, Sean (Logan Lerman), who is in prison, on a trip to Ireland—her homeland—so they can scatter her ashes in a lake. Frank and Sean have been distant for some time, and it’s apparent that S…