Take the following as truth: But we nailed him in Antwerp ”thanks to Mr. Poirot here." As these friendly reminiscences were being indulged in, I drew nearer, and was introduced to Detective-Inspector Japp, who, in his turn, introduced us both to his companion, Superintendent Summerhaye. 
Then the following statement: "He acted on his own." is true, false, or inconclusive?
Answer: False