Michael Frayn's Copenhagen, a hit in London for more than a year, will officially open at Broadway's Royale Theatre, April 11, after playing previews from March 23.

Philip Bosco, whose many credits include Lend Me a Tenor, Moon Over Buffalo and the recent Lincoln Center Theater Twelfth Night, co-stars in Copenhagen, opposite Blair Brown and Michael Cumpsty.

The play follows German physicist Werner Heisenberg, who, in 1941, made a trip to Copenhagen to see his Danish counterpart, Niels Bohr. They were old friends, and their work together had opened the way into the atom, but now they were on opposite sides of a world war, and the meeting would end in disaster. Scientists and historians have argued ever since about why Heisenberg went and what the two men said to each other. Copenhagen retraces their journey through the mysteries of the world around us -- and on into the even stranger mysteries of the world within.

Brown, who recently left the cast of James Joyce's The Dead at the Belasco Theatre, has also appeared in Cabaret and The Secret Rapture. Though on the ascendant on Broadway, she's still arguably better known for her film work in "Altered States," "Continental Divide" and "One Trick Pony," and for being television's Molly Dodd. Cumpsty's recent Broadway roles have included 1776, Racing Demon and Translations.

Michael Blakemore, fresh from his success with Kiss Me, Kate, directs Frayn's three-character, psychological drama. Producing the work are The Nederlander Organization, Roger Berlind, Scott Rudin, Ray Larsen, Jon B. Platt and Elizabeth I. McCann, with Michael Codron and London's Royal National Theatre. Copenhagen received its world premiere at the RNT's Cottesloe venue May 28, 1998 and later transferred to the West End's Duchess Theatre. Michael Frayn's stage plays include Alphabetical Order, Make and Break and Noises Off, all of which received Evening Standard Awards for Best Comedy of the Year and Benefactors which received the Evening Standard Award for Best Play of the Year. His translated work includes The Cherry Orchard and Wild Honey for the National, Three Sisters, The Seagull and Uncle Vanya. He has published eight novels and a volume of philosophy and has written the screenplays for "Clockwise," starring John Cleese, and "First and Last," which won an international Emmy Award.

Director Blakemore has had a long association with Frayn, staging many of the plays mentioned.