When St. Patrick has driven all but one crafty snake out of Ireland, the mice--Ryan, Brian, and Tulla--devise a risky plan of their own to outwit the wily reptile.
Fourteen-year-old Cassie, feeling like an outsider while on a cruise to Martinique with her father and her new stepfamily, becomes involved in helping Charles, a cute boy her own age, solve a mystery that has been haunting his family for years.
With help from her new friend Ryan, thirteen-year-old Cassie explores the mysteries surrounding a mansion in Maine that was once an Underground Railroad stop and is now a retirement home.
