There are 2 books in the Blackhearts series. The newest book is Blacksouls which came out in 2017.

1
Blackhearts

Book cover of Blackhearts
In this stunningly creative debut "filled with well-drawn characters...and smoldering passion," (Booklist) Nicole Castroman reimagines the origins of history's most infamous pirate-Blackbeard.

When Edward "Teach" Drummond, son of one of Bristol's richest merchants, returns home from a year at sea, he finds his life in shambles. Betrothed to a girl…
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2
Blacksouls

Book cover of Blacksouls
Nicole Castroman brings the dangerous pirate ports of the Caribbean to life in this vibrant sequel to Blackhearts-the reimagined origin story of history's most infamous pirate, Blackbeard.

Edward "Teach" Drummond is setting sail to the Caribbean as first mate on the most celebrated merchant ship in the British fleet-until he…