Malcolm Merlyn makes his move in the officially released synopsis for "Eleven-Fifty-Nine," the April 6 episode of Arrow.
Rob Hardy directed the episode written by Marc Guggenheim & Keto Shimizu. You can see the synopsis below.
Oliver (Stephen Amell) and Diggle (David Ramsey) learn that Merlyn (John Barrowman) is going to try to break Darhk (guest star Neal McDonough) out of prison. Meanwhile, Laurel (Katie Cassidy) gets a surprising offer and Felicity (Emily Bett Rickards) has a heart-to-heart talk with Curtis (guest star Echo Kellum).