Northumberland: the winter of 1937. In a remote moorland cottage, Steven Coulter, a young history teacher, is filled with sadness & longing at the death of his wife. Through a charismatic colleague, Frank Embleton, & Frank`s sister, Diana, he is drawn into the beguiling world of a group of musicians, & falls gradually under their spell. But as war approaches a decision is made which calls all their lives quite shockingly into question. Moving between the beauty & isolation of the moors, a hill-town school & a graceful old country house, Trio delicately explores conscience & idealism, romantic love & most painful desire. Throughout it all, the power of music to disturb, uplift & affirm is unforgettably evoked.