Emily and Stephen Carter’s ordinary life changes when Emily buys a mysterious blue zircon pendant at a roadside market outside Santa Fe. The vendor gives her one unsettling warning: do not sleep while wearing it. Emily ignores the warning. Soon afterward she discovers she is pregnant with twins and begins experiencing vivid geometric dreams and sensations that suggest something unusual is happening long before the children are born.

Elliott and Lillian Carter arrive with an uncanny calm around one another. As they grow, their intelligence accelerates far beyond normal developmentand their connection proves deeper than sibling intuition. They communicate and coordinate in ways conventional science cannot explain, seeming at times to share perception itself.