**_Shatner as a “puppy dog left in the middle of the road”_** A troubled man in his early 40s (William Shatner) meets a lovely widow in Tampa (Jennifer Bishop), but her young daughter becomes increasingly suspicious of him. Shot in August, 1972, but not released until 1974, “Impulse” is a psychological drama with bits of romance and crime thrills. The murders are along the lines of any Columbo TV movie, but don’t expect a detective investigation. The focus is on the disturbed protagonist (or is it antagonist?) with the filmmaking being subdued, like “Haunts,” which came out a couple of ye...