The Netherlands swarmed with spies and informers, and a single unguarded expression of opinion was sufficient to send a man to the block. And, indeed, in a vast number of cases, private animosity was the cause of the denunciation; for any accusation could be safely made where there was no trial, and the victims were often in complete ignorance as to the nature of the supposed crime for which they were seized and dragged away to execution. When the vessel sailed Sophie Martin gave her husband a letter to her father and brothers, begging them to follow the example of thousands of their countrymen, and to leave the land where life and property were no longer safe, and to come over to London. They would have no difficulty in procuring work there, and could establish themselves in business and do as well as they had been doing at home. They had, she knew, money laid by in London; for after the troubles began her father had sold off the houses and other property he had purchased with his savings, and had transmitted the result to England by her husband, who had intrusted it for investment to a leading citizen with whom he did business. As this represented not only her father's accumulations but those of her brothers who worked as partners with him, it amounted to a sum that in those days was regarded as considerable. "I feel anxious, Ned," Captain Martin said as he sailed up the Zuider Zee towards the city, "as to what has befallen your grandfather and uncles. I have always made the best of the matter to your mother, but I cannot conceal from myself that harm may have befallen them. It is strange that no message has come to us through any of our friends trading with the town, for your uncles know many of my comrades and can see their names in the shipping lists when they arrive. They would have known how anxious your mother would be at the news of the devil's work that is going on here, and, being always tender and thoughtful for her, would surely have sent her news of them from time to time as they had a chance. I sorely fear that something must have happened. Your uncles are prudent men, going about their work and interfering with none; but they are men, too, who speak their mind, and would not, like many, make a false show of affection when they feel none.