Impostress — Lisa Jackson

Kiera of Lawenydd couldn't believe what she'd done. Owing her sister a favor, Kiera promised to pose as Elyn on her wedding day. The ruse was to last just one night, but the following morning Elyn was nowhere to be found! Surely Kiera wouldn't have to spend the rest of her wedded life to the baron picked out for her sister, a man to whom she could never admit the depths of her deception--even as her desire for him grew impossible to resist.

It was obvious to Lord Kelan of Penbrooke that something was amiss with his new bride. But despite his misgivings, he couldn't deny that he was falling in love with the dark-haired beauty. Until he uncovered exactly what she was up to, Kelan would keep the mysterious woman by his side--all the while keeping the fierce stirrings of his heart a well-guarded secret...