The Unseen (Echoes from the Past, #5)

2014. When skeletal remains are discovered in a bathtub concealed in a secret chamber in a London mansion, Quinn’s only clue is a Fabergé necklace that may have belonged to the victim. As she delves into the life of Valentina, a young Russian refugee who came to live in the house after the Russian Revolution, she’s reminded once again that sometimes truth is stranger than fiction.
1917. Wealthy, beautiful, and titled, Valentina has enjoyed a gilded existence, but the winds of change blow across Russia, forever sweeping away the life she knew and bringing unspeakable pain and loss. Thrust into the role of head of the family, Valentina quickly learns that not everyone can be trusted, and sometimes true love can be found in the most unexpected places.