Agatha Christie: Murderers Abroad.  Five complete novels:  They Came to Baghdad, Murder in Mesopotamia, The Mystery of the Blue Train, Passenger to Frankfurt, So Many Steps to Death.  Also available:  Five Complete Novels of Murder and Detection, another collection of 5 Agatha Christie novels.  I'm happy to combine items to reduce your shipping cost, so be sure to click on "Seller's Other Items."