As a research assistant for a Texas detective agency, Maggie Haslo has a knack for connecting the dots. She can see that the facts don't add up in the suspicious death of her friend Mando. A history professor at the local university, Mando was killed in what the police are calling a drive-by shooting-but Maggie's not buying it. Before his death, Mando had invited Maggie to the diving site of a sunken Spanish galleon off the Gulf coast; when her friend, Sister Clare, asks her to come investigate suspicious circumstances at her convent on nearby Mustang Island, Maggie decides to combine trips. A few days later, a nun is murdered, and Maggie makes a shocking discovery: the deaths of Mando and the nun are related. As she drives back and forth between the city and the island with her faithful German shepherd, Zoe, Maggie must put aside her sadness for the friends she has lost in order to be strong for friends that are still living. In the process, she meets more trouble than she could have imagined, but also a blue-eyed detective-who turns out to be trouble of different kind. Maggie's detective skills are about to be put to the ultimate test. Can she crack the case before another dead body shows up?