Luka and Emilia travel to London to find the last of the Graylings tribe, who has married a Puritan lawyer and turned her back on her past. As well as all the perils of the capital city, the children must escape the vengeful Coldham, and still get to Kingston-Upon-Thames in time to rescue their families. Then on the anniversary of his greatest victory; Cromwell is mysteriously struck down. Will anything change? And can the children save their family in time?