It truly depends on the meaning intended.
If what is intended is something like:
attirbuted the recent rise of psychological thrillers to the general rise in melding the traditional genres about women's emotional relationships and the detective story,
then there would be a vague way to convey the idea that psychological thrillers are one specific manifestation of a more general phenomenon.
If what is intended is something like:
attributed the rise of the psychological thriller to that genre's combining the appeals of stories about emotional relationships and stories about who-done-it,
then them would be a vague way to convey the idea that the genre of the psychological thriller appeals to two different but compatible interests.
The problem is that, at least out of context, the quoted language is very muddy. Having experience giving interviews, I am well aware that it can be difficult to give clear answers to hard questions on the spur of the moment. The person quoted may have had a clear thought and failed to express it well. Or she may have not had time to articulate a cogent answer to an unanticipated question.