Fresh from a visit to the 1930s on Boardwalk Empire, Stephen Root is delving further into the past with Turn. Root has joined the upcoming AMC drama about the Culper Ring, the Revolutionary War spy network who provided George Washington with information on British troop movement in and around New York.

The real-life story of the Culper Ring is a fascinating one, as the group used aliases, coded messages, and invisible ink to pass information right under the noses of the British occupying New York throughout the war. The network was so secret, even Washington didn't know the identity of all its operatives, and the public wasn't made aware of the Ring until the 1930s.

Root will play Nathaniel Sackett, Washington's spymaster who creates that network. Jamie Bell plays the lead as one of his agents. The series begins in April.