Vlad Series by Beth Orsoff

Most schoolteachers count the days until summer vacation, but not Gwen. Sure, she loves her job, but it doesn't exactly pay well. So when a student's father asks her to fill in for his nanny for the summer, Gwen should be thrilled. After all, Alexander Romanescu is insanely wealthy, and she adores his daughter, Isabella. And yet? And yet she can't shake the nagging feeling that saying yes to this ...