Chrestomanci, the most powerful magic-user in the world, has been weakened by a mass of enemy witches and sorcerers, and has to call on his magic support staff for back-up. But even they're not enough to turn the tide, so Chrestomanci and his allies put all their effort into summoning Chrestomanci's wife, Millie, the most powerful enchanter in the world after Chrestomanci and his apprentice. The look that crosses Chrestomanci's face highlights just how deep their relationship is.
In Witch Week, a handful of kids in a boarding school classroom discover they are witches. This is a problem, as the world they are in still practices witch hunts and burnings. Chrestomanci (a powerful enchanter) explains that this world shouldn't even exist, and should be merged back into the world it originally belonged. One child, Charles, contests this and becomes extremely self-centered about his magic, seemingly enough to be seen as the start of a career as an evil warlock, when he discovers this would mean he would lose his magic. In the end, in a rather moving scene, he's the one that ends up instigating the merging in a change of heart, but loses his memories before he could apologize to Chrestomanci. Chrestomanci thanks him anyway in the newly united world (though Charles has no idea who he is) before leaving himself.
The Lives of Christopher Chant
Christopher reclaims the soul of Mordecai Roberts (Tacroy).
"What has Tacroy done to make himself yours?" "He lied for me for a whole day. And he was believed."
Stealer of Souls
Gabriel mentioning that Christopher's last life is in Millie's wedding band. The obvious heartwarming here is the fact that Christopher literally trusts his wife with his life, but there's also the fact that Gabriel believes it's much safer with her than it was when he kept it locked away in his own safe. It says a lot about how much he trusts Millie and seems to approve of her and Christopher's relationship.
The Pinhoe Egg
When the little griffin has to decide if it rather wants to spend his life with Cat or it's Mother