These are the books by Jonathan Stroud that are reviewed on this site:
Charlie has lost her best friend Max. He drowned at the mill pond. Or was he bewitched? And can she really fetch him back?
Nathaniel is junior in the government now, but he still needs his djinni, Bartimaeus, to help him out of a tight corner. Pity then that Bartimaeus is less than willing...
A weedy boy with magic powers gets in way over his head.
Brilliant conclusion to a brilliant trilogy. What is to become of John Mandrake? Has he got a conscience after all? All will be revealed...
Lockwood & Co prove themselves to be the best psychic investigations agency in London...eventually, maybe.