Shadow Prince — Jennifer Dunne

Book Two in the World Gates series.

The kingdom of Nord D'Rae was destroyed ten years ago, although there are hundreds of theories as to how and why it happened. Popular sentiment blames the bastard prince Reynart D'Altha. But no one is foolish enough to ask the deadly assassin that Reynart has become. Fantasy artist Angie Blanchard was assured by her psychiatrist that her visit to the imaginary kingdom of Nord D'Rae was a particularly vivid coma dream. The obsession threatens not only her sanity but her life. Finding out that the fantasy world is real doesn't change that threat, only transforms it. When Angie is magically transported to Reynart's world, his plans for vengeance are interrupted by the mage council's representative. The destruction of Nord D'Rae destabilized the world's magical gateways, a situation which has recently become critical. The mage needs both Angie and Reynart to help her restore the broken Nord D'Rae gateway, then seal it for good. On their quest, they must face the lies and betrayals of ten years ago. Too bad they'd rather kill each other.