In 1989, soundings in the Pacific Ocean off Alaska detected a single male whale whose mating call registered at a frequency of 52 hertz-a range beyond what any prospective mate would be able to hear. Having since become a metaphor for unrequited love, he was heard from off California in 2014 for the first time in 11 years... and this documentary from Jonathan Zeman ("Cropsey") offers an intriguing look at an expedition to find him as well as his overall legend. 96 min. Widescreen; Soundtrack: English.