The dark volume - Gordon Dahlquist

With old loyalties tested by new and unlikely alliances, Miss Temple, Doctor Svenson, and Cardinal Chang must call on every reserve of courage to face a new and desperate struggle - after all, the integrity of their very minds is at risk. From palace intrigue and a city in turmoil to wolf-haunted mountains, underground tunnels and a suspicious hidden factory, they must overcome war and heartache to battle old enemies and a host of new villains, all hoping to seize for themselves the power of the blue glass books. Now one glass book in particular drives them all, its deadly contents the key to controlling the secrets of the blue glass, or destroying it forever.