Colonel Sandhurst to the Rescue by M.C. Beaton
A case of mistaken identity is transformed into a case of true love!
As usual, the poor relations are in need of money to finance the hotel and this time it is up to Colonel Sandhurst to come to the rescue. After coming across Sir Randolph's daughter Frederica, who is running away to escape an awful marriage to Lord Bewley, the Colonel devises a plan to force Sir Randolph to settle his six month outstanding hotel bill and save Frederica from her terrible fate.
The clever plan is thwarted when Lord Bewley shows up at the drop point instead of Sir Randolph, and the poor relations must make a deal with Lord Bewley in order to get their money... and keep Colonel Sandhurst out of gaol!