Amy and Dan Cahill hit the high seas as they follow the trail of some infamous ancestors to track down a long lost treasure. However, the real pr

The Cahills are back with a vengenance in this all new novel.

The gang is back, and called to investigate one of their own: Sinead Starling.

Amy and Dan hit the high seas as they follow the trail of some infamous ancestors to track down a long lost treasure. However, the real prize isn

Vesper One commands Dan and Amy Cahill to steal the Golden Jubilee, one of the world's largest diamonds, but they are unaware that a more siniste

Unable to return to their normal lives despite the end of the Clue hunt, new Madrigal leaders Amy and Dan anxiously prepare for a retaliatory str

Returned by a surprising twist to their first mission on U.S. soil since the beginning of the Clue hunt, Amy and Dan discover evidence of a mole

It started with a kidnapping. A shadowy organization known only as the Vespers snatched seven members of the Cahill family and demanded a series

Allie is ecstatic when Mrs. Hunter informs her fourth-grade class that they are putting on a play. However, when Cheyenne, Allie's bitter rival,

When their father is called away, three children move to the country, where they stay busy saving the train from accidents, befriending a nice Ol

All her life Aurora has heard stories about how wonderful and lucky Heidi is, and soon this paragon (now grown up and expecting a baby) will be v

Thirteen-year-old Dan Cahill and his sister Amy thought they'd finally won the hunt for the source of their family's power. But soon they find th