Some years ago Miss Theodosia Tremere and Marcus Williams, Viscount Steyne, had met and fallen in love. Theodosia was then living with her vicar father, who was a selfish man who did not value her as he should have, but she felt it her duty to continue to care for him. This angered Marc, who felt that she should have been very willing to marry him instead and be loved and cherished by him. When her father died, he left most of the money to go to a church building project in his name, leaving very little for Theodosia to live on. Theodosia had told Marc he must wait, but when he did not come after her father died, she took a position as governess in the Heythrop household.
Theodosia at least lucked out in her position at Charton Court, as Lord and Lady Eastwick and their family treated her as one of them. Lord Eastwick was off doing something diplomatic in America when one of the children, little three year old Katie, died. The surviving children - Edward, Charlotte, Eleanor, John, Thomas and Amy - have been low in spirits since Katie's death, so Theodosia thinks to help them by giving them a summer project: finding the Heythrop treasure, the secret of which had been lost hundreds of years ago.
Meanwhile in London Marc's older widowed sister is being courted by James Heythrop, Lord Eastwick's younger brother, a thoroughgoing scoundrel who wants Ruth for her money. When Marc journeys with James down to James's estate, ostensibly to be shown that James is an eligible suitor, they stay at Charton Court, and Marc is astonished to see Theodosia there. With James on the prowl for the treasure, the children matchmaking, and Marc still angry at her over their past, Theodosia will be hard put to sort it all out.
