There are 3 books in the The Witch's Child series. The newest book is Julia Unbound which came out in 2018.

1
Julia Vanishes

Book cover of Julia Vanishes
"An exciting novel with magic and serial killers.... One of the hottest books coming out."—Hypable.com

Fans of Marie Lu, Leigh Bardugo, and Kristin Cashore will be captivated by this stunning first book in a must-have new fantasy trilogy about a spy who can vanish at will and who discovers that…
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2
Julia Defiant

Book cover of Julia Defiant
Fans of Graceling and Six of Crows will thrill to the masterful world-building and fiercely flawed heroine in this heart-pounding follow-up to Julia Vanishes, book two in the Witch’s Child trilogy.
 
“Adventure, murder, romance, intrigue, and betrayal with a 16-year-old heroine that is both fierce and flawed at the same…

3
Julia Unbound

Book cover of Julia Unbound
In this heart-pounding conclusion to the Witch's Child trilogy, Catherine Egan's masterful world-building and fiercely flawed heroine will thrill fans of Graceling and Six of Crows.

Julia has been ensnared in so many different webs, it's hard to see how she'll ever break free. She must do Casimir's bidding in…