The two best introductions to the early modern European witch trials are Brian P. Levack’s The Witch-Hunt in Early Modern Europe Fourth Edition (Routledge, 2016) and Julian Goodare’s The European Witch-Hunt (Routledge, 2016). Levack is very good on the (many) causes of the trials. His book is accompanied by Brian P. Levack’s The Witchcraft Sourcebook Second Edition (Routledge, 2015) which contains excerpts from primary sources.

Ronald Hutton’s The Witch: A History of Fear, From Ancient Times to the Present (Yale University Press, 2017) covers the history of beliefs in harmful magic starting with ancient Egypt and Mesopotamia. He has a lot of material on British witchcraft beliefs such as familiars.

Two other good academic books on the witch trials are Johannes Dillinger’s The Routledge History of Witchcraft (Routledge, 2020) and Brian P. Levack’s The Oxford Handbook of Witchcraft in Early Modern Europe and Colonial America (Oxford University Press, 2013). Both of these edited volumes have separate chapters for different countries such as France and Germany.

Wolfgang Behringer’s Witches and Witch-Hunts (Polity Press, 2004) has a global scope and covers witch-hunting from the Roman period to the twentieth century. Robin Briggs’ Witches & Neighbours (Fontana Press, 1996) focuses on the early modern trials at the village level.

EDIT: Thomas Waters' Cursed Britain: A History of Witchcraft and Black Magic in Modern Times (Yale University Press, 2019) is about witchcraft in Britain and the British Empire from 1800 up to the present day.

EDIT 2: Owen Davies' The Oxford Illustrated History of Witchcraft & Magic (Oxford University Press, 2017) is written by academic experts for a mainstream audience. It has chapters on medieval learned magic, the early modern witch trials, the anthropological study of witchcraft, modern occultism, witches in TV and film, and other subjects.

EDIT 3: Owen Davies' America Bewitched: The Story of Witchcraft After Salem (Oxford University Press, 2013) deals with witch-hunting in the United States from the eighteenth century onward.