The search for the map-and the secret behind its cryptic code-intensifies in a quest across time, space, and multiple realities. But what if the true treasure isn't the map at all . . . what if the map marks something far greater? Something one world cannot contain? Those who desire to unlock that mystery are in a race to possess the secret-for good or evil. Kit Livingstone is mastering the ability to travel across realities using ley lines and has forged a link from the Bone House, a sacred lodge made of animal bones, to the fabled Spirit Well, a place of profound power. His friend Mina is undercover in a Spanish monastery high in the Pyrenees, learning all she can from a monk named Brother Lazarus. Still determined to find Kit, she is beginning to experience a greater destiny than she can fathom. Cassandra Clarke is overseeing an archaeological dig in Arizona when a chance encounter transports her to 1950s Damascus. There, she finds herself unwillingly drawn to the Seekers-the last living remnants of the Zetetic Society who need her help to track down the missing Cosimo Livingstone and his grandson Kit. But there are darker forces at work in the universe whose agents always seem to be one step ahead of the rest-and they're all desperate to gain the ultimate prize in this treasure hunt where the stakes increase at every turn. At the heart of the mystery lies the Spirit Well.