Mom's Last Wish by Charlene Neil

After fifteen years away from home, Lucy Donald receives an email from her mother's personal assistant, Cameron Bishop, compelling her to return. Soon after Lucy's arrival, threatening letters start to appear, and Lucy realizes her life is in actual danger. She seeks comfort in the arms of the alluring Cameron Bishop, but can Cameron really be trusted?
Lucy's return home and the events that unfold lead to an intense and suspenseful atmosphere.
Left to uncover the mysteries by herself, she finds herself grappling with the dilemma of not knowing whom to trust.