There it was, hanging in the sky above the school: the blazing green skull with a serpent tongue, the mark Death Eaters left behind whenever they had entered a building... wherever they had murdered...
When Dumbledore arrives at Privet Drive one summer night to collect Harry Potter, his wand hand is blackened and shrivelled, but he does not reveal why. Secrets and suspicion are spreading through the wizarding world, and Hogwarts itself

...

After learning about his magical ancestry and his own warrior powers, sixteen-year-old Jack embarks on a training program to fight enemy wizards.

While trying to clear their names as the prime suspects in a series of vicious murders, Emma and Jonah must take sides in an epic battle that will decide the fate of the magical world.

Dangerous adventures continue for the djinni Bartimaeus and his master, seventeen-year-old Nathaniel, a powerful magician who is serving as England's minister of information.

Fourteen-year-old Jason Walker is transported to a strange world called Lyrian, where he joins Rachel, who was also drawn there from our world, and a few rebels, to piece together the Word that can destroy the malicious wizard emperor, Surroth.

Wise-cracking djinni Bartimaeus finds himself at the court of King Solomon with an unpleasant master, a sinister servant, and King Solomon's magic ring.