Of Heroes and Villains — Mark Delaney

Meet Misfits, Inc. Investigations: Peter, the genius; Jake, the athlete; Byte, the computer whiz; Mattie, the “magician.”
These four teenage super-sleuths have a knack for uncovering and solving unsolvable crimes. In their second case, Of Heroes and Villains, the team is mysteriously summoned to a comic book convention, where they anticipate the premiere of the exclusive new Hyperman superhero movie. At the convention, the Jester (a comic book villain come-to-life) terrorizes the audience and commits a daring crime.
When the Misfits attempt to solve the Jester's riddle, they discover that someone close to them may be involved in the heist. As they draw dangerously close to unmasking the villain, the Misfits uncover a longtime wrong that only they can right.
Featuring an engaging group of outcasts with varied interests, each book in the Misfits series offers an intriguing mystery, supported by Delaney's well-paced plot and believable dialogue, that will keep readers captivated to the very end.