Cross My Heart is by Sasha Gould. The first book in the Segreta series. The story is set in Venice in the year 1585. Laura della Scala is the second daughter in a prominent, but deteriorating, family. On the death of her older sister Beatrice, she is returned from the convent where she has been living to her family home to marry the fiance of her dead sister and save the family fortune. Only her fiance is old enough to be her grandfather. In desperation she turns to the Segreta, a secret society of women who deal in secrets and manage much that goes on in Venice, albeit behind the scenes. The Segreta accepts Laura as a member and prevents her marriage, but when Laura begins to suspect the Segreta was involved in her sister's murder, she must decide where her true loyalties lie.
Ratings: 8th grade - 8 out of 10 - V (violence).