Sandalphon isn't the most popular Archangel, or the handsomest, or even the strongest, but he might be the kindest. For seven years, he's watched over his charge, a young woman named Mikayla Frost. He's dried her tears, fulfilled her wishes, and helped her make new friends, but now they're facing a new challenge: Death. Mikayla passes away just after her seventeenth birthday, leaving her beloved grandfather behind. Even in life, Mikayla enjoyed helping people, so spirit school is right up her alley. Her instructor, "Sander Phelan," is super cute... but he's hiding a huge secret.

Archangel Jophiel is a cad, and his behavior hasn't gone unnoticed by his peers. When his womanizing ways come to light, he is put on probation and punished in a most fitting way. He's now an instructor for fledgling spirit guides. Jophiel is paired with Chris Pho, a young man whose life was tragically short. Chris' relentless goodness is unfamiliar to Jophiel, who just might learn something from his new student. Chris has never had a girlfriend, and he's never really wanted one... until he meets Archangel Haniel.

Archangel Reyla is a low-key Archangel enjoying a quiet afterlife of slaying shadowlings, granting human wishes... and crocheting. Out of the blue, she gets a text from Archangel Gabriel, who she's never met before. Because of her high rating and aptitude for fighting (Reyla's great with a bow), she's being scouted as a possible member of The Echelon, an elite group of Archangels who are privy to the afterlife's secrets. Archangel Gabriel will be in charge of training Reyla, as well as another Echelon candidate named Mikah. Gabriel makes her nervous, and Mikah is critical of her in a way that's highly frustrating. Not only that, she doesn't want the extra attention! Still, Reyla decides to undergo the special training to sate her curiosity. After all, what's the worst that could happen? School for Spirits: Loneliest Archangel features a more adult set of characters, while retaining the spirit (pun intended) of the series. Content warning: Mentions of suicide, sexual assault

Orias is a fallen angel, condemned to wander Earth for all eternity. Most angels would be ashamed of such a status, but Orias flaunts it. A rebel and a trickster, Orias is proud of what he is, and has no desire to return to the world of spirits... until he's approached by his old friend Sandalphon, who begs him to change his ways. Getting back into Archangel Michael's good graces won't be easy. First, the rebellious Orias will have to complete a few missions as a spirit guide, and prove he can be a good boy. But can he? Orias is paired with Kate, a lonely young girl who becomes his reluctant new partner. Unfortunately, they have nothing in common.

Lucy Alvarez, a recent Spirit School graduate, is presented with a unique opportunity. She's asked to become one of Archangel Azrael's "Helpers," a group of spirits who guide the recently deceased to the afterlife. Lucy is definitely no stranger to death. She lost her mom when she was twelve, and at age fifteen, she was diagnosed with cancer, a disease that ultimately claimed her life. She's an obvious choice to work with the Angel of Death. To become a Helper, Lucy undergoes training with Archangel Azrael himself. The Angel of Death is a handsome enigma, cold yet compassionate, and difficult to befriend. School For Spirits: Angel of Death is the fourth book in the Spirit School series.

Nicholas is a profoundly lonely man, mourning the loss of a dead wife and a daughter who no longer loves him. His best and only friend is Lillie, a spirit who is always at his side. They do everything together, he just can't see her. Lillie has been Nicholas' spirit guide for a long time, and knows everything about him. She understands his pain, forgives his mistakes, and knows his wishes... and it's her job to make them come true. This novella is a spinoff of the YA series "School for Spirits," and can be enjoyed as a standalone story.

Alyx Keating failed at life. Now she's failed at death. She thought she was done with spirit guide school, but she's not. She's not even close. Because she graduated with a colossally bad rating, she's called back another round of lessons with a new instructor. Her teacher, Phineas, is a pompous angel with a terrible attitude and little patience for her slacker attitude. Meanwhile, the lead singer of Alyx's favorite band might be more attainable than she thinks... Alyx, Leigh, and Taishi all return in this sequel to School for Spirits: A Dead Girl and a Samurai.