Living with the Enemy (film)

Living with the Enemy is a 2005 film starring Sarah Lancaster as Allison Conner, a young woman who meets a handsome software billionaire, Phillip Lauder Mark Humphrey, while attending a technology conference with her boss. A romance quickly develops between the two, Phillip proposes, and they quickly marry. However, Allison soon discovers that his first wife, Monique, may not have died as she is told, prompting her to investigate.

Source: Wikipedia