Case closed
Somebody closed Murder at Ravenshollow Manor. Your turn.
They found the contradiction without being told where it was. Open the same case and see whether your first three questions get you there.

Classic Whodunit · 1927, an isolated country estate in the Yorkshire Dales
Murder at Ravenshollow Manor
A storm has cut the manor off from the world. Lord Ravenshollow lies dead in his library — and everyone under this roof had a reason.
3 suspects · medium · 45–60 min · free
Nothing on this page gives anything away — it knows whether the case was closed and nothing about how.