English poet Roger Green left the safety of God, country, and whiskey to immerse himself in an austere and sober life on the Greek Island of Hydra. But when Green discovered that his terrace overlooked the garden of sixties balladeer Leonard Cohen, he became obsessed with Cohen's songs, wives, and banana tree. Hydra starts with a poem the author wrote and recited for his fifty-seventh birthday (borrowing the meter of Cohen's "Suzanne," and ripe with references to the song), with Cohen's ex-partner Suzanne, who may or may not be the subject of Cohen's song, in the audience. By turns...