WHAT REALLY HAPPENED TO ABIGAIL MORGAN? HENRY AND ABE FINALLY DISCOVER THE GUT-WRENCHING TRUTH, ON ABC'S "FOREVER"

"The Night in Question" - Henry tackles the most important case of his career: the disappearance of the love of his life, Abigail, after she left him. Desperate to find out where she might have gone, Abe, unbeknownst to Henry, secretly contacts Lucas to help find clues to her whereabouts. Already involved in a murder investigation with Jo, Henry involves Lucas and the team of detectives under the guise of searching for "Abe's mother" -- never letting on his own relationship with Abigail. Henry and Abe's anxiety is ratcheted up as one terrifying domino falls after another until Henry uncovers the horrifying details of Abigail's last secret, on "Forever," TUESDAY, APRIL 21 (10:00-11:00 p.m., ET), on the ABC Television Network.

Forever" stars Ioan Gruffudd as Henry, Judd Hirsch as Abe, Alana De La Garza as Detective Jo Martinez, Lorraine Toussaint as Lt. Joanne Reece, Donnie Keshawarz as Detective Hanson and Joel David Moore as Lucas.

Guest starring are Mackenzie Mauzy as Abigail Morgan, Janet Zarish as older Abigail, Burn Gorman as Adam, Boris McGiver as Vance and Tim Guinee as Teddy Graves

"The Night in Question" is written by Phil Klemmer and directed by Michael Fields.

"Forever" and is broadcast in 720 Progressive (720P), ABC's selected HDTV format with a 5.1 channel surround sound. A TV parental guideline will be assigned closer to airdate.

For more information on "Forever," visit ABC.com/Forever.