Pathfinder: Secrets of Magic is a rules supplement trove for players and GMs alike for Pathfinder 2e. Within the 256 pages of this tome you will find TWO new classes for Pathfinder 2e. The Magus combines spellcasting with martial prowess, while the Summoner has the ability to summon and control a magical companion creature to fight alongside them.
Along with these two new classes you'll also be gaining access to countless offerings for all characters. New spells, magic items, and lore of the fundamentals of magical theory within Golarion abound within this book.
Finally, the book also includes a special sections titled the Book of Unlimited Magic. This section presents new methods to spellcast, such as elementalism, geomancy, shadow magic, rune magic, and pervasive magic (which can give anything a magical spin in your games).