Black Orchid (1953): British Crime Mystery

Pretty good British crime film short/2nd feature, in which a Doctor's estranged ex-wife ends up dead after being poisoned. Suspicion immediately falls upon the Doctor, who has fallen for his dead wife's sister, and appears to have reason to want his ex out of the way. Whilst in police custody, it's left to the sister and a close friend to try and prove his innocence.