And Mr Corazzini is the one person I'm sure didn't leave his seat before dinner. We know Marie LeGarde can't have had anything to do with it. "This was the men's washroom, I take it?" If you're an arsonist looking for a cast-iron alibi and want to be five miles away when the fire starts, it's the perfect answer." It's been used hundreds of times, especially in war-time sabotage. All you have to do is to crush the tube, break the glass, drop the tube in your chosen spot, walk away and after a predetermined time the acid that was in the glass eats through the shield, meets the other acid and starts a fire. In one compartment you have a free acid, in the other a different acid enclosed in a glass tube. You can get a little plastic tube with a central composition shield dividing it into two compartments. I always peek through the cabin door from time to time, and he was always there." She looked at me for a long moment before answering, and even in the fading light of the aurora I could see the understanding coming into her eyes. "Of course." She stared at me, wide-eyed. Who could have gone into the galley then -anybody in the front seats, I suppose?" "Tell me, Miss Ross, did anyone ask you earlier in the evening when dinner would be?" "And reduce the number of suspects-though, I suppose, he could still have got an accomplice to plant the acid tube." Then, suddenly, I had what was, for me, an inspiration. "That seems to cut him out," I said thoughtfully.
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