The Disneyland Quest (Disneyland Quest #1)

15 year-old Dizzy Walker and his younger sister Ana are about to meet their mom's new boyfriend, Steve, and his son, Travis, for the first time. To make the introduction go smoothly, Steve offers to pay for Dizzy and his family to meet in Disneyland; Dizzy's favorite place in the world.
When they arrive at the theme park, they learn about a once in a lifetime treasure hunt called The Disneyland Quest. Clues are hidden throughout Disneyland, leading the quest participants to the combination of a vault set up on Main Street and the $250,000 prize inside.
Dizzy, Ana, and Travis must work together in a race against the clock, thousands of opponents, and the mysterious man in red who follows them throughout the quest. Friendship, perseverance, and trust are all put to the test in The Disneyland Quest.