A Tangled Web — Julia Parks

When Sincerity Hartford decides to impersonate her Great Aunt Prudence, love is the last thing she expects to find.
Sincerity Hartford believes even the best truth can be made better with a little flummery. So when she intercepts a letter naming her the heiress to her late Great Aunt Prudence, it seems Fate has answered her prayers. She convinces her domineering mother that Great Aunt Prudence wants her to visit her in Bath and takes up residence in her aunt's home. Everything is going well until her mother writes “Aunt Prudence” demanding verification of the rumors she has heard about Sincerity and a certain handsome widower, Sir Simon McKendrick. With her mother's arrival eminent, Sincerity must convince the man of her dreams to join her charade. Shocked and amused, Simon agrees to help, never realizing that getting mixed up with Sincerity's hair-brained scheme is the fastest route to falling in love.