Unknown
7 books
Gateways
2003
ISBN 9780765346056
Hosts
2001
ISBN 9780812561661
The Haunted Air
2002
ISBN 9780812557312
Harbingers
2006
ISBN 9781887368841
Crisscross
2004
ISBN 9781887368704
Legacies
1998
ISBN 9780812571998
Conspiracies
1998
ISBN 9780765361370