Implicated (1999)

In this offbeat thriller, Ann is a young woman trying to put her life back together after she lost her child in a car wreck. Formerly a single mother, Ann has recently started dating a man named Tom, and one day Tom asks Ann for a favor -- would she be willing to baby sit for his boss' daughter? Ann agrees, and she soon finds herself becoming quite fond of the little girl. However, before long, Ann discovers Tom has something less than honest up his sleeve