"Finally the connecting door gave, but with such a crash that I knew those outside must have heard. Instantly the outside knocking became a violent battering, while keys sounded ominously in the hall doors of the rooms on both sides of me. Rushing through the newly opened connexion, I succeeded in bolting the northerly hall door before the lock could be turned; but even as I did so I heard the hall door of the third room--the one from whose window I had hoped to reach the roof below--being tried with a pass-key."
"For an instant I felt absolute despair, since my trapping in a chamber with no window egress seemed complete. A wave of almost abnormal horror swept over me, and invested with a terrible but unexplainable singularity the flashlight-glimpsed dust prints made by the intruder who had lately tried my door from this room. Then, with a dazed automatism which persisted despite hopelessness, I made for the next connecting door and performed the blind motion of pushing at it in an effort to get through and--granting that fastenings might be as providentially intact as in this second room--bolt the hall door beyond before the lock could be turned from outside."
"Sheer fortunate chance gave me my reprieve--for the connecting door before me was not only unlocked but actually ajar." -- The Shadow Over Innsmouth