The Shamer Chronicles:

• THE SHAMER'S DAUGHTER (2002)
• THE SHAMER'S SIGNET (2003)
• THE SERPENT GIFT (2005)
• THE SHAMER'S WAR (2005)

W.I.T.C.H. Adventures:

• WHEN LIGHTNING STRIKES (2004)
• HEARTBREAK ISLAND (2005)
• STOLEN SPRING (2005)
• THE CRUEL EMPRESS (2005)

Nina Borg:

• THE BOY IN THE SUITCASE (2011)
• INVISIBLE MURDERS (2012)
• DEATH OF A NIGHTINGALE (2013)

Standalone Novels:

• SILVERHORSE (2007)
• MIDNIGHT (2009)