Case open
The Empty Frame beat somebody today.
They ran out of questions before they ran out of suspects. The case is still open, and the contradiction is still provably in there.

Classic Whodunit · 1955, Wren & Sons auction house, St James's, London
The Empty Frame
London, 1955. On the eve of the auction of the century, Sir Julius Wren lies dead in his own vault — beside a rediscovered Vermeer that five people would kill to sell, to keep, or to burn.
5 suspects · hard · 60–90 min · free
Nothing on this page gives anything away — it knows whether the case was closed and nothing about how.