This bestselling classic mystery filled with “clever sleuthing” (Publishers Weekly) by two brothers looking for information about their missing mother from three-time Edgar Award­–winning author Willo Davis Roberts is a thrilling roller coaster ride of a read.

Rick and Kenny’s Pa was right all along—troubles really do happen in threes. First Pa’s truck was robbed, then Pa ran off, leaving Rick, Kenny, and Ma to fend for themselves, and now Ma has disappeared, too! Rick knows Ma would never leave them on purpose—but then, where is she? Waiting in Uncle Henry’s trailer park doesn’t seem to be getting them any closer to figuring out what happened.

Instead the brothers, along with their new friends Connie and Julie, head to the abandoned Wonderland Amusement Park next door to search for answers. But what they find inside sends them on the most terrifying roller coaster ride of their lives. Could whoever took Ma be after them as well?