Inside the Lines is a thrilling novel that takes readers on a journey through the world of international espionage during World War I. The story follows the protagonist, Harvey Henderson, a young American intelligence officer working undercover in Europe. As he navigates the dangerous landscape of secret codes, double agents, and covert missions, Henderson must stay focused and vigilant in order to complete his mission and bring down the enemy.

Author Earl Derr Biggers does an excellent job of creating a sense of tension and suspense throughout the book, keeping readers on the edge of their seats as they follow Henderson's every move. The characters are well-developed and the plot is full of unexpected twists and turns that keep the story engaging and exciting.

Overall, Inside the Lines is a gripping and well-written novel that is sure to captivate fans of historical fiction and spy thrillers. With its fast-paced action and intriguing storyline, this book is a must-read for anyone looking for an exciting and entertaining read.

Book Description:
As World War I commences, a plucky young American woman in Europe on a business trip begins to realize that she may have remained too long. She and others anxious to leave for home are caught up in events swirling about them. A mysterious British officer becomes involved. This romance-tinged spy thriller begins on a train in Calais bound for Paris and ends in Gibraltar.

Based on a 1915 play of the same name, the novel was adapted for the screen in a 1918 silent version and again as a “talky” in 1930. This was the third novel written by Biggers, who went on to write six Charlie Chan novels in the 1920’s and 1930’s. -- Lee Smalley