Yesterday's Shadow: Prequel to the Lacey Summers, PI, Mystery Series

While doing research for her beloved uncle, Lacey meets Mark, a handsome stranger, and is very attracted to him. Then she discovers her apartment burglarized, her uncle killed and both she and her mother are suspected of being involved in his murder.Mark reappears. As her uncle's friend and neighbor, he offers to help Lacey solve the crime. But someone doesn't want it solved. What is the murderer looking for and why? Is Mark a friend or the real murderer?