The book "Inside the Lines" (Inside the Lines), co-written by Earl Derr Biggers and Robert Welles Ricci, is an exciting novel that combines the elements of a spy detective and a romance novel. The main character is a young American diplomat who finds himself in the middle of complex intrigues in Europe during the First World War. He must decide whose side he is on and what price he is willing to pay for his beliefs and love. Cracking the code, going abroad, saving his life and the lives of those he loves are just some of the tasks before him. "Within the Lines" is an exciting thriller that will keep you in suspense until the last page.