Xandra Collins was rich, famous, and missing. After inheriting a fortune, she vanished without a trace, leaving her 100-year-old mansion abandoned. A frightening enemy had been stalking the wealthy heiress. Thirteen-year-old detective Skylar Robbins moves into the deserted estate with her family, and vows to crack the case. Skylar teams up with her BFF Alexa, and Daniel Gannon?the most brilliant boy in middle school?to solve the mystery of Xandra Collins's disappearance.Secret codes and mystifying clues lead to a hidden key. Skylar and Daniel must outsmart Xandra's enemies and brave life-threatening waves to locate the lock and solve the mystery. Can the team determine how the heiress went missing...before Skylar suffers the same fate?Skylar Robbins: The Mystery of the Missing Heiress won the 5-Star Reader's Favorite award and seal. "Cross's characters are credible and finely drawn, her Santa Monica location is perfect, and her plot is suitably twisty and filled with suspense. Skylar Robbins: The Mystery of the Missing Heiress is most highly recommended." A favorite of both boys and girls, ages 9 to adult.