UnScramble this Word: r r n w e p a?

Questions

In the board game Cluedo, which room is situated directly between the kitchen and the conservatory?

What alternative name is given to the Barn Owl because of its harsh cry?

Which writer's first novel, published in 1948, was Never Love a Stranger - his 23rd and latest, published in 1997, is Tycoon?

Which writer's latest work, Birds of Prey , features the Courtneys - the family that appeared in his first, When the Lion Feeds , published in 1964?

Which capital city stands on the north shore of the river Plate estuary?