Lucifer: The Devil at Heart is the fourth collection of Dan Watters' run on Lucifer (Volume 3) which contains issues 20–24 that were originally meant to be published but they eventually were only released into this collection.
Synopsis for "An Unfortunate Bargain"
Appearing in "An Unfortunate Bargain"
Featured Characters:
- The Hunted God (Beverly Walsh) (Flashback and main story) (Also in a dream sequence) (Resurrected)
- Lucifer Morningstar (Flashback and main story) (Also in a dream sequence)
Supporting Characters:
- Biyu (First appearance) (Flashback and main story) (Origin)
Antagonists:
- Achilles (In dream sequence only) (Cameo)
- Duma
- Remiel
Other Characters:
- Biyu's father (Single appearance) (Unnamed) (Flashback only)
- Damned souls (Cameo)
- Demons
- The Rhyming Beast (Single appearance) (Unnamed)
- Destiny (Cameo)
- Hellhounds (Cameo)
- Jia (Single appearance) (Dies in flashback)
- Mei (Single appearance) (Dies in flashback)
- Angels (Mentioned only)
- Biyu's mother (Unnamed) (Deceased) (Mentioned only)
- Caliban (Deceased) (Mentioned only)
- God (Mentioned only)
- Gods of China (Mentioned only)
- Nuwa (Mentioned only)
- The Hunters (Mentioned only)
- Bela Lugosi (Mentioned only)
Locations:
- Earth 0
- Sphere of the Gods
- The Dreaming
- Garden of Forking Ways (Cameo)
- Hell
- Heaven (Mentioned only)
Items:
- Book of Destiny (Cameo)
- The Devil's Eye (First appearance)
- The Devil's Heart (Behind the scenes)
- Key to Hell
Concepts:
- Magic
- The Wild Hunt (Mentioned only)
Synopsis for "I Am the King of Cats"
Appearing in "I Am the King of Cats"
Featured Characters:
- Lucifer Morningstar (Also in a vision)
Supporting Characters:
- Behemoth the Cat
- Beverly Walsh
- Destiny (In a vision)
- Sam (First appearance)
- Muffins the Cat (First appearance)
Antagonists:
- Mike (Single appearance)
- The Old Man (Single appearance; dies) (Unnamed)
Other Characters:
- Steven (Single appearance) (Cameo)
- The Endless (Mentioned only)
- Dream/King of Cats (Morpheus) (Deceased) (Mentioned only)
- Sam's mother (Unnamed) (Mentioned only)
Locations:
- Earth 0
- England
- Yorkshire
- The House of the Hunted God
- Yorkshire
- England
- Sphere of the Gods
- Garden of Forking Ways (In a vision)
- Hell (Mentioned only)
Items:
- Book of Destiny (Also in a vision)
Concepts:
Synopsis for "Dear Mazikeen"
Appearing in "Dear Mazikeen"
Featured Characters:
- Lucifer Morningstar (Flashback and main story) (Erased)
- Mazikeen
Supporting Characters:
- Francisco Goya (Single appearance) (Dies in flashback)
- Javier Goya (Single appearance) (Flashback only)
- Ruskin
Antagonists:
Other Characters:
- Leocadia (Single appearance) (Flashback only)
- Necropolitans
- Rosaria "Rosa" Weiss (Single appearance) (Flashback only) (Cameo)
- Angels (Mentioned only)
- Charles IV of Spain (Mentioned only)
Locations:
- Earth 0
- Sphere of the Gods
- Litharge
- The Necropolis
- Hell
- Litharge
Items:
- Book of Destiny (Mentioned only)
- Lucifer's Letter (Single appearance)
- Moonlight Blade
- "Saturn Devouring His Son" (Flashback only) (Origin)
Concepts:
Synopsis for "A Man of Many Talents"
Appearing in "A Man of Many Talents"
Featured Characters:
- Lucifer Morningstar (Flashback only)
Supporting Characters:
- Behemoth the Cat
- Biyu
- The Hunted God (Beverly Walsh) (Possessed)
- Mazikeen
- Sam
- Muffins the Cat
- Remiel
Antagonists:
- The Host of Heaven (Flashback and main story) (Cameo)
- The Archangel Michael (Flashback and main story) (Cameo)
- The Archangel Uriel (First appearance; unnamed) (Cameo)
Other Characters:
- Agh (Single appearance) (Dies in flashback)
- Damned souls (Cameo)
- Demons
- Duma (Cameo)
- Gruugh (Single appearance) (Flashback only)
- God (Mentioned only)
- Jesus Christ (Mentioned only)
Locations:
- Earth 0
- Prehistoric Era
- Earth (Flashback only)
- 21st Century
- Prehistoric Era
- Sphere of the Gods
Items:
- Book of Destiny (Mentioned only)
- The Devil's Eye
- The Devil's Heart
- Moonlight Blade
- Michael's Sword (Flashback only) (Cameo)
Concepts:
- Magic
- War in Heaven (Flashback only)
Synopsis for "Goodnight, Mr. Lucifer"
Appearing in "Goodnight, Mr. Lucifer"
Featured Characters:
- Lucifer Morningstar (Resurrected)
Supporting Characters:
- Beverly Walsh
- Biyu
- Destiny
- Mazikeen
- Sam
- Muffins the Cat
Antagonists:
- The Host of Heaven
- The Archangel Michael (Real name revealed) (First full appearance)
- The Archangel Uriel (Real name revealed) (First full appearance)
Other Characters:
- Bela Profokyevna (Single appearance)
- Bela's brother (Single appearance; dies) (Unnamed)
- Bela's parents (Single appearance) (Unnamed) (Cameo)
- Demons
- Duma (Dies) (Resurrected)
- Remiel (Dies) (Resurrected)
- The Endless (Mentioned only)
- God (Deceased) (Mentioned only)
- Lilith (Mentioned only)
- Johann Sebastian Bach (Mentioned only)
Locations:
- Earth 0
- Sphere of the Gods
- Garden of Forking Ways
- Heaven
- The Silver City
- The Primum Mobile (Mentioned only)
- The Silver City
- Hell (Cameo)
Items:
- Book of Destiny
- Key to Hell
- Michael's Spear
Concepts:
- Magic
- War in Heaven (Mentioned only)
Notes
- The story continues from Lucifer: The Wild Hunt (Collected).