Legends of the Riftwar (Legenden van de Oorlog van de Grote Scheuring)

co-authored with another well-known sf/fantasy-author

Eerste legende - De eervolle vijand (Honoured enemy)
co-authored with William Forstchen

ISBN 90 290 7085 4 (hardback)
320 pp.
Translation: Richard Heufkens
Cover illustration: Nico Keulers
Dutch translation 2001
Tweede legende - De drie huurlingen (Murder in LaMut)
co-authored with Joel Rosenberg

ISBN 90 225 3260 7 (hardback)
288 pp.
Translation: Richard Heufkens
Cover illustration: Rien van der Kraan
Dutch translation 2002
Derde legende - Robbie de hand (Jimmy the Hand)
co-authored with S.M. Stirling

ISBN 90 225 3484 7 (hardback)
319 pp.
Translation: Richard Heufkens
Cover illustration: Rien van der Kraan
Dutch translation 2003