Colin finally returns to the Oldcastle Big House to show his new wife, Ella, the family estate in County Meath, but he is devastated when he finds the grounds in dire neglect and the Big House deserted.

After catching Kyle attempting to steal from the summer castle, Colin and Ella are both so touched by his remorse and shame that they decide to turn their abandoned estate into an alternative to prison for teenagers, like Kyle, who were forced into criminal activities by a parent or guardian. Their young charges would serve the rest of their prison sentence at the Big House estate, where they would be given a second chance to turn their lives around.

Once their new venture begins, Ella starts to sense that stealing from the estate isn't the only connection Kyle has with the Big House. Ella had originally returned to Ireland to solve her own life-changing mystical puzzle, but now she will need to unravel the mystery surrounding Kyle before someone ends up getting hurt.