The Clock Strikes Thirteen by Mildred Wirt features the daring young reporter Penny Parker as she investigates a puzzling mystery linked to a strange clock that chimes thirteen times at midnight. Drawn by the bizarre occurrences that follow each chime, Penny sets out to uncover the secret behind the clock's unusual behavior.

As Penny digs deeper, she discovers that the clock is at the center of a web of intrigue involving hidden rooms, secret messages, and a shadowy figure who will stop at nothing to keep the truth hidden. With her sharp instincts and determination, Penny navigates through danger and deception to solve the mystery.

Set against a backdrop of suspense and hidden secrets, The Clock Strikes Thirteen is a thrilling adventure that challenges Penny's wit and courage. It's a must-read for fans of mystery and intrigue.