Spinster Sister by Elise Marion

Helena Montgomery is left to care for her siblings after the deaths of her parents. Buried under a pile of debt, she has no choice but to join her friends in a dangerous scheme. Moonlighting as a masked highwayman is a sure way to end up facing the hangman, but there is nothing Helena wouldn’t do for those she loves. Besides, she only intends to continue her illegal activities until her sister’s first season yields an advantageous marriage.

Lord Sebastian Radcliffe doesn’t want a wife, but must select one to secure his family legacy. The young, beautiful Harriett Montgomery seems like the perfect choice—yet Sebastian finds himself drawn instead to her elder sister. He never expected to marry for love, yet the vivacious Helena quickly burrows her way past his stony façade and straight into his heart.

He thinks her a high-handed shrew; she thinks him a self-righteous bore. Yet, passion kindles between this unlikely pair, leaving them hopeful that the futures they once thought impossible might be within reach. However, the damaging secret of Helena’s crimes hangs over her head, forcing her to keep Sebastian at arm’s length. Despite her best efforts, she is unable to deny the depth of her feelings. When the truth is exposed, will Helena lose the man she has come to love?