Adoringly, Edward by Sydney Winward

They locked him in that tower for his own good. But no one ever mentioned that it was the most dangerous place of all…

Edward Beaumont has suffered from a heart condition all his life, and all he wants to do is experience life in its fullest. He sneaks out of his locked tower, dons a mask, and attends a masquerade where he meets a beautiful woman who was everything he never knew he wanted.
Parted without knowing her name, he tries to search for her, but a tower and his sickness stand between them.
Lady Vivienne Winfield makes it a game of finding her masked hero, only to panic when a game turns into a race against time. If she doesn’t locate him within two weeks, she will be married to the duke and lose all chance at future happiness.
Vivienne and Edward battle against the ticking clock when they learn devastating secrets about themselves that could shake the foundation of their world. When something even more sinister enters the arena, will they win the race against time? Or will they be too late?