Mystery
There is a major overlap between the
Mystery
category amd
Whodunnit
. Arguably, Whodunnits are a sub-set (a specific form of Mystery). In addition, the Mystery category contains those mysteries that do not involve murder.
There is another sort of play that is
not
covered by this category, which is the Medieval Mystery Play. Those were plays on religious subjects, so if we publish anything along those lines, then the Religious and Moral category is the place to search.