Books
Sisters of the Night
1995
ISBN 9780446671439
Sherlock Holmes
2010
ISBN 9780312378462
Unidentified Funny Objects
2012
ISBN 9780988432802
Death by Gaslight
1982
ISBN 9780451119155
The Empress of India (Professor Moriarty #4)
2006
ISBN 9780312291440
Perchance
2011
ISBN 9781322233789
Infernal Device
2014
ISBN 9781783293261
Empress of India
2014
ISBN 9781783293322
Who Thinks Evil
2014
ISBN 9781783293346
Great Game
2014
ISBN 9781783293308
To The Stars - And Beyond: The Second Borgo Press Book Of Science Fiction Stories
2011
Bells of Hell
2019
ISBN 9781780291512- No cover
IF Worlds of Science Fiction, 1970 September-October
1970
ISBN 1415670102 
The Unicorn Girl
1969
ISBN 9781587154201
Transmission Error
1970
ISBN 9780515045147
Pluribus
1975
ISBN 9780385029254
The Infernal Device (Professor Moriarty #1)
1979
ISBN 9780451084927
The Last President
1980
ISBN 9780688036102
Star Griffin
1987
ISBN 9780385193955
The spymaster's handbook
1988
ISBN 9780816013142
A study in sorcery
1989
ISBN 9780441790920
A gallery of rogues
1994
ISBN 9780671850326
How to solve a murder
1995
ISBN 9780028604107
How to try a murder
1997
ISBN 9780028612911