Based on the clue 'agatha christie wrote i believe a speck of dust wo...', what is the answer?

Based on the clue 'agatha christie called a man in this job the best ...', what is the answer? Based on the clue 'agatha christie mystery in which an heiress is mur...', what is the answer? What is associated with: agatha christie set hercule poirot afloat on a boat called the karnak in this exotic 1937 nove… What is associated with: agatha christie was staying in aswan when she wrote this 1937 mystery about a young womans mur… Based on the clue 'agatha christies mysteries solved by this detectiv...', what is the answer? Based on the clue 'agatha mary clarissa miller used this married name...', what is the answer? What is associated with: age 87 at his death in 1864 he was the oldest man ever to serve as chief justice of the us? Based on the clue 'age of a sophomore horse its also the usual age of...', what is the answer?