Lost in Shadow by Jocelyn Kelley

Meet the Nethercott sisters: China, Jade, and Sian. Their dear, eccentric father died before he could convince the world of the existence of ghosts. Now, out of mourning, Jade is ready to prove him right. But soon she’ll wish she were dead wrong…

Murder most foul! Jade hears whispered in the halls of Nethercott Castle. Sir Mitchell Renshaw’s ghost has come to tell her that he died at the hands of his fiancée’s brother, Sir Gideon Bannatyne. As presumptuous in death as in life, he demands that Jade travel to London to protect his beloved, who, Renshaw believes, is also in mortal danger…

Sir Bannatyne is a gentleman in name only, with his penchant for fast sport and faster women — and he sets Jade’s body afire with a mere glance, even as he makes her an indecent bargain. But he proves his mettle when he risks arrest rather than ruin Jade’s reputation. Now she must decide whether to heed the ghost’s warning or follow her heart — and revel in what might be a killer’s embrace….

This book was only read once and is still in an excellent condition