He is the author of twenty crime thrillers set in various European cities, including the critically acclaimed interpretation of Danish TV drama The Killing and the Nic Costa series set in Rome. His ability to capture the sense of place and atmosphere of the cities in his novels comes from spending considerable research time there. David was inspired to write his new detective crime series starring Pieter Voss ( The House of Dolls, its sequel The Wrong Girl and now Little Sister) after exploring the city of Amsterdam..