By now a Lieutenant in the Federation Survey Service, Grimes, finds himself serving aboard the cruiser Aries bound for the planet El Dorado. Abundantly wealthy, and inhabited only by the super-rich and their android servants, the population nevertheless has an increasingly urgent problem. The men are infertile, cause unknown, and the women want someone to do something about it. After crash-landing the advance party rocket boat on a lake, Grimes meets the beautiful but haughty Princess Marlene von Stolzberg. Once again out of his depths Grimes will need every ounce of his famous luck to get him back in the good books and hopefully salvage his career prospects.