The Mystery of Specter Island - The Cari Turnlyle Series, #4

When Cari accepts Bob's invitation to join him for a vacation in Wisconsin, she has no idea what's in store. The relaxing week away turns nightmarish early on when she startles an intruder at Bob's family's bed and breakfast. His aunt confesses that this isn't the first break-in: it's the fourth one in as many weeks. She has started to lose business and feels helpless to put a stop to it. Never one to walk away from an investigation, Cari teams up with the local sheriff's department to track down the mystery man.
The closer she gets to his true identity, the more mysterious the case becomes. As she pours her attention into finding the intruder, she realizes Bob is becoming increasingly distracted. Once again, she struggles to balance her love of sleuthing and her personal life. Can she save the family business and her relationship?