The haunting fear that perhaps he had made a grievous error in his dealings with Sub-lieutenant Fordyce, whose resolution and intelligence he had completely underrated, prompted him to make the journey without undue delay.

It was in his case an easy matter to leave the country. Through influence he was made a member of the Red Cross organization for the relief of wounded Russians, and, armed with credentials, he departed via the North Sea and Scandinavian railways to the Finnish town of Tornea, whence, by devious and uncertain travelling, he had made his way to Petrograd, arriving just twelve hours before Fordyce made his audacious yet ill-advised call at the house in the Bobbinsky Prospekt.

Mindiggle's suspicions were well founded, and, before the Sub had paid his visit, Vladimir Klostivitch had been warned of the possibility of being questioned by British naval officers.

Klostivitch immediately began to make enquiries. He soon learned that two Englishmen from a submarine lying at Cronstadt had recently landed from a Government steamer; that they had proceeded to the British Embassy, and thence to a house in which lived a compatriot.

The German agent wanted to be present at the anticipated interview, but this Klostivitch would not permit, avowing that he was quite capable of trapping the interfering Englishmen without assistance, and when this was done Mindiggle would be at liberty to converse with the captives.

"Hallo, Fordyce!" exclaimed the Hun from his place of safety. "I suppose you did not expect to find me here? How's that ferocious dog of yours? 'Costs against the plaintiff,' eh? Well, it will be a jolly dear bite for you before I've done with you."

"You think so?" enquired Fordyce coolly.

"I don't think—I know it!" replied Mindiggle. "Might I enquire why you've come here and tried to foist a spurious packet of diamonds upon my friend Klostivitch?"

"For motives best known to myself—and others," said the Sub stiffly.

"What motives?" enquired the spy, unable to restrain his curiosity.