Take the following as truth: Poirot might have excellent reasons for his belief in Inglethorp's innocence, but a man of the type of Summerhaye would require tangible proofs, and these I doubted if Poirot could supply. 
Then the following statement: "I knew for certain that Poirot could provide tangible evidence of Inglethorp's innocence. " is true, false, or inconclusive?
Answer: False