The year is 2003, and Crowford Castle is struggling to attract visitors. Winifred Croft leads guided tours, telling people about the castle's history, but the cracks are starting to show and soon the entire site could be sold. Then, one night, a shocking accident seems to kill Winifred, leaving no trace of her body. The year is 1648, and the English Civil War is in full swing. Besieged by the enemy, Crowford Castle is on the verge of collapse when a mysterious woman appears, claiming to have come from the future. For Winifred Croft, who has spent all her life studying history, the past has suddenly come vividly to life. Can she find a way to survive, or will the siege of Crowford Castle lead to the deaths of everyone inside? Meanwhile, back in the year 2003, Winifred's daughter Lydia tries to get in touch with her mother's ghost. As she begins to uncover the castle's shocking secrets, however, she begins to realize that two old legends about the building might be true after all.