Answers on a postcard, to arrive by Monday 29 March: DETAILS 398, IoS, 1 Canada Square, London E14 5DL. Three winners will each receive a bottle of champagne
Details 423 came from John Everett's Millais' The Vale of Rest (1858/9), which has some claim to being Millais' last good picture. He was 29, with a long and successful career ahead of him. There is no story: this is an exercise in pure atmospherics. Rather as in one of those moments of grand opera, when we're treated to a tolling bell and a monks' chorus and a belting duet and premonitory rumblings in the lower strings, so here we have Catholic nuns, a graveyard with a dug grave, a twilight of silhouettes and an expression of sudden anguish. It's in the Tate Gallery.
The first three correct entries came from: Mrs P Humphrey, Somerset; Helen Warlow, North Yorkshire; Malcolm Smith, London SE5