Reluctant witch Diana Bishop and vampire Matthew Clairmont seek refuge in the fascinating and treacherous world of Elizabethan London. There, they must find a powerful witch to help Diana control her magic and search for the elusive Book of Life.

As she continues her search for a mentor, Diana meets wealthy alchemist Mary Sidney. London's vampire ruler demands fealty.

In the present, Domenico makes a disturbing discovery in Oxford. Back in 1590, Matthew must beg for forgiveness from Father Hubbard.

Another vicious vampire murder rocks present-day Oxford. Marcus makes a breakthrough.

Matthew and Diana arrive in France on their journey to face Philippe. Elsewhere, Louisa and Kit cut a swathe through London.

Philippe makes a troubling discovery, provoking a conflict with Matthew. Ysabeau, Em and Sarah start to look for a message.

Matthew and Diana go to Bohemia to search for Edward Kelley and the Book of Life. There, they encounter the strange Emperor Rudolf II.

In 1590, Diana is transfixed as she tries to work out what the Book is telling her. Matthew worries over the Book's power.

As Diana and Matthew return to London, Diana learns news that could change everything. The Queen holds Matthew to account.

Realising that she must return to the present, Diana aims to complete her training.