Witches' Sabbath — Alexander Cordell

The cauldron of revolution is boiling over and igniting the passions of the
people of Ireland. The year is 1798 and seventeen year old John Regan
faces danger and even death as he struggles alongside the leaders of the
rebellion as they attempt to capture a valuable English hostage.

The second in a trilogy of books set in 18th century Ireland, from the bestselling
author of Rape of the Fair Country.