Sentinelspire (novel)

Sentinelspire is the fourth book in The Citadels series. It was written by Mark Sehestedt.

"To save the future, he must embrace his past...

A druid and his apprentice are captured by a group of assassins who demand their help in overthrowing their leader and the ruler of the fortress of Sentinelspire, the Old Man of the Mountain. Although the druid doesn't want to help, he discovers the Old Man's plans may involve the master druid who gave him a new life--and the destruction of all he now holds dear."

the fortess of sentinelspire lookes down from the canopy of the world, ready to sow the seeds of destruction.

Death flows from the fortress of the old man hidden in the canyons of Sentinelspire, a vas and dromant volcano. the secret paradise of FaerÛn's most dangerous assassins, the fortress specializes in high-profile murders that leave no witnesses.

but with the power of an archdruid at hand, the mad master of the fortress will bring death to more than just the enemies of his patrons- he will call down doom on all of FaerÛn.

Sentinelspire has been waiting to complete the cycle.