Another follow-up to Please Don't Tell My Parents I'm a Supervillain by Richard Roberts, following Mirabelle, sister to Entropy, and featuring cameos of characters from all of the previous books.
Mirabelle has many friends with amazing superpowers that let them go on adventures. Her superpower includes being made of glass, and having her body break from such mundane actions as running too much. A chance (or is it?) encounter in school acquaints her with a crystal artifact, part of the heart of a dragon, that offers her power and protection if she allows it to use her.
Of course, she rejects the obvious trap, right? Well, sort of... I mean a little power won't corrupt her all that much, will it?
This book provides examples of the following tropes:
- Advance Notice Crime: Entropy tells Mirabelle in advance that he's going to use his mirror magic to steal two shards of the Heart of Vermiel from his on-and-off girlfriend Little Witch. Since Mirabelle is his sister and a non-combatant in the heroes vs villains thing, he doesn't consider it a big secret to keep from her. As Mirabelle has another of the shards and the shards can locate each other, she promptly piggybacks off his mirror magic teleportation with her own to steal one of the shards out from under Entropy's nose.
- Ancestral Weapon: Jebediah uses a rifle that once belonged to his grandfather.
- Artifact Domination: The Heart of Vermiel causes the bearer of the shards to be more destructive, and yearn to seek out the other pieces. It's indicated that possessing all four shards will replace the bearer's mind with that of Vermiel.
- Artifact of Doom: The Heart of Vermiel is an object that is believed to be able to resurrect an ancient and hostile dragon.
- Beware the Silly Ones: Mirabelle and her mother point out this trope for Pretty Bubbles, who can control suds, but is able to use it to readily defeat Entropy.Starshine: I've warned the boy it's heroes with silly weak powers you have to watch out for. They have to be smart or they're nothing at all.
- Bittersweet Ending: Jeb and the Heart merge together to form one being but it means that neither of them is entirely the same person anymore.
- Cargo Ship: In-universe. Mirabelle and the Heart of Vermiel, which also qualifies as a Toy Ship as they're both adolescents (Vermiel's fragment being mentally the same age as her).
- Censor Suds: This is Pretty Bubbles's in-universe costume.
- Clingy MacGuffin: The Heart of Vermiel is a group of four pieces of a crystal heart. All four pieces are destiny-bonded not just to the person who most recently held that piece, but to each other, meaning each piece is clingy to four entities - a person, and the other three pieces of the Heart. Without powerful binding magics, chance and fate will bend to guarantee they keep returning to their destiny-bound person and causing their destiny-bound holders to keep finding each other.
- Curse Cut Short: "Another Character Interrupts" version. Entropy starts complaining about a new superheroine, Pretty Bubbles, who defeated him. His mother, Starshine, cuts off his complaints just before Mirabelle figured he was going to start swearing.
- Dating Catwoman: Entropy (Supervillain) is dating Little Witch (Superhero) and is getting obsessed with Pretty Bubbles (also a hero)
- Demoted to Extra: Penny, Claire, Magenta, and Avery all show up in supporting roles to Mirabelle.
- Fantastic Racism: Jeb was raised by his grandfather, a Mad Scientist, to hate everyone with superpowers.
- Friendly Enemy: Supervillain Entropy is in an ill-defined on-and-off relationship with heroes Little Witch and Pretty Bubbles.
- Fusion Dance: Jeb and the Heart merge so that they become one person.
- Heart Symbol: Mirabelle notes that the four shards together form a heart symbol, a possible hint that it really isn't the heart of a dragon. It turns out that, at the least, it carries Vermiel's intelligence and power, which overwrite the bearer.
- Incompatible Orientation: Cassie has a crush on Penny Akk, but Marcia says Penny is heterosexual and that Cassie will thus never get close to what she wants.
- Kaiju: When fully empowered by the heart, Mirabelle is the size of a building, correspondingly strong and tough, and breathes pink flame.
- Loophole Abuse: Marcia can't accompany Mirabelle on a supervillain mission due to her pact with Mourning Dove (who is keeping Marcia's powers from killing her). However, once a rival would-be thief attacks Mirabelle, Marcia is able to join in the fray since she is technically intervening to stop a robber, even if she's letting the other intruder escape.
- MacGuffin: Namechecked by Marcia in reference to the Heart of Vermiel, though the Heart is an active entity.
- Ninja Pirate Robot Zombie:
- Mirabelle is a Cat Girl made out of glass who can later become a giant monster.
- Jeb becomes a giant cyborg dragon teenage boy.
- Power Crystal: The Heart of Vermiel is a pink crystal, broken into four pieces, which is believed to be the heart of the dragon, Vermiel. Each piece offers more power to the bearer, but also influences them to act on their more bestial impulses and further transforms them into Vermiel himself. When the four pieces are finally united in one person, it's indicated that the bearer's personality remains present in the body, melded with Vermiel.
- Sealed Evil in a Six Pack: The Heart of Vermiel has been split into four pieces. The bearers will be influenced to find and unite the other pieces.
- Serious Business: Mirabelle drops her normal Nice Girl attitude to warn Jeb he can't use Secret Identity names casually.“Listen. Listen! The heroes and villains have rules. You don’t need to like the rules or agree with them. The rules seem like a friendly joke but they’re merciless. Do not ever say that name again. Not when you’re talking about her powers. It doesn’t matter if it’s right or wrong. If anybody even thinks you’ve given away a hero or villain’s identity, you’ll be killed. You can hate heroes and villains more for that if you want but it’s true and they don’t forgive or give second chances and I may not be happy with you but I don’t want you to."
- Ship Tease: Marcie and Claire have some of this with both of them awkwardly flirting over battles.
- Super Costume Clothier: Downplayed example - Gravitimmy is a Mad Scientist who creates forcefield devices. While he doesn't make outfits directly, his inventions make impractical superhero/supervillain outfits wearable. Some supers buy his products as shields and armor, but his real fortune comes in from selling tiny forcefield inserts to make outfits not chafe.
- This Is Unforgivable!: Jeb's awkward attempts at flirting with Mirabelle fail due to the fact he tried to shoot her brother.
