* The Last Train to Lisbon: This international bestseller follows a German professor who discovers a mysterious notebook left on a train and embarks on a journey to uncover the secrets of its owner, a Portuguese doctor who fled to Lisbon during the war.
* The Girl from Trieste: This novel tells the story of a young woman who is forced to flee her home in Trieste during the war and the dangerous path she takes to find her family.
* The Spy in the House: This suspenseful novel follows a group of Italian Resistance fighters who are tasked with uncovering a Nazi spy who has infiltrated their ranks.
* The Secret of the Old Clock: This is a young adult novel that follows a group of children who discover a secret about their family's past during the war.
Simoni's writing is known for its vivid descriptions, compelling characters, and historical accuracy. He has received numerous awards for his work, including the Premio Bancarella for his novel "The Last Train to Lisbon."