Elly Griffiths is the pen name of Domenica de Rosa (born 17 august 1963, London), a British crime novelist. She has written two series as Griffiths to date, one featuring Ruth Galloway, the other featuring Detective Inspector Edgar Stephens and Max Mephisto.
Can we infer the following?
Elly Griffiths series only features men as the main characters

Pick your answer from:
a). Yes
b). It's impossible to say
c). No
The answer is:
c).