Forever

After dying in a train accident, Dr. Morgan must keep his friends at NYPD from learning that he's immortal.

The police label the case of a bridge jumper a suicide, while Henry pegs the case as a homicide, so he and Jo go on a rogue investigation for proof. Meanwhile, Henry's anonymous caller surfaces again. Apparently, he has been tracking Henry for years. A letter on antique stationary might provide Henry a fascinating clue about the caller, and he enlists Abe's help in tracing the note's history to a foreign locale. Revealing flashbacks unveil the beginning of Henry's great love affair with Abigail (recurring guest star Mackenzie Mauzy). Guest stars include James McCaffrey (Rescue Me, Revenge) as Browning and Dave Quay as Paul.

While Henry is interested in aging and how to die, New York's wealthy elderly are chasing a way to turn back the clock. A clinic is dispensing a pricey product called Aterna, which is supposed to provide the much-sought-after fountain of youth. Instead, Henry and Jo are confronted with multiple deaths from the costly potion, which, instead of revolutionizing the aging process, is turning people's brains into Swiss cheese. Henry remembers back to a dear friend who was diagnosed with tuberculosis in 1906 and discovers a link to this current case. Meanwhile, unbeknownst to Henry, Abe would love to be young and youthful again and is tempted to try Aterna. Plus, Henry learns that however long you live, you must live every day and hour like it's your last. Guest stars include Eric Morris (Blue Bloods) as Dr. James Carter and Mather Zickel (House of Lies, Newsreaders) as Dr. Frederick Gardner.

When the matriarch of one of New York's wealthiest families dies, the family demands answers; memories brought on by the case torment Henry.

What looks like a death by drug overdose of a reformed junkie turned community activist results in Henry and Jo tracking a murderer. The complex investigation involves dirty dealings between a real estate developer and a community organizer with millions of dollars at stake. Henry flashes back to the same 1890s New York tenement where he worked as a doctor to help the poor, including an orphan boy who gives Henry a special handmade gift. Meanwhile, Abe cooks up a Sunday dinner feast for Henry, Jo and himself. When Jo tries to find out how the two men know one another, Henry weaves an elaborate tale to cover the truth. Guest stars include Juan-Pablo Veza as Raul and Caleb McLaughlin as Alejandro.

When a human heart is delivered fresh out of a body to the homicide division, Henry and Jo end up in the middle of a Jack the Ripper copycat murder investigation. But it doesn't stop there. A second killing resembles another infamous, unsolved crime: the Black Dahlia murder. Henry has seen it all before, as flashbacks show his involvement with the original cases from two very different periods of his long life. However, Henry's anonymous caller tips him to search beyond the clues of these classic killings and leads the police squad to profile a very different, yet disturbed suspect. Guest stars include Paul Fitzgerald (Treme) as Mark, Rosalind Chao (I Am Sam) as Frenchman and Andy Murray (The Blacklist) as Abberline.