Knight of Her Life by Marisa Chenery

To the world, Jacqueline was dead, but when her father kills her twin in a joust, she claims her brother’s identity to seek revenge. Worried at being discovered, and taking tentative steps out into the world again, it never occurs to her that she might meet the one man who can make her wish she had never started her ruse.

Sir Terric Aubrey worked the tournament circuit, hoping to make enough money to buy land. He had not thought much beyond his next win. He certainly had not expected to find the woman he wanted for his wife posing as a man.

Though fate tries to keep them apart, Jacqueline will do whatever it takes to keep her knight at her side, even if it means she must stand against her powerful father at the risk of all.