“The Retreat” (**1/2 out of four) was a moderately compelling horror melodrama about a lesbian couple (Tommie-Amber Pirie and Sarah Allen) who are trying to maintain their rocky relationship go to a wedding retreat and end up having to set aside their differences and unite when a group of serial killers target them. Ultimately never transcends its standard conventions and genre cliches but is more proficient than others of its kind, with good acting and stylish touches from director Pat Mills and cinematographer David Schuurman. Takes its time at the beginning but fairly gripping once it gets going.