Marty and Grace Books in Order

The Marty and Grace books follow the same core adventures as Cryptid Hunters, but seen through the lens of the two cousins’ relationship. Marty starts the series loud and impulsive, the kind of kid who cracks jokes even when he’s terrified. Grace is quieter and more cautious, carrying anxiety about her health and her place in the family. When a helicopter crash takes their journalist parents out of the picture, both of them lose the life they thought they understood.

Life with Uncle Wolfe forces them to rebuild from scratch. His island is full of new rules, new gadgets, and a constant stream of visiting scientists, pilots, and animal handlers. Marty latches onto the excitement of being connected to a famous cryptozoologist. Grace, who learns that her history is far more tangled than she realized, has to renegotiate who she trusts and what “family” even means. Their bond with each other ends up mattering more than any revelation about bloodlines.

Each adventure stretches that bond in different ways. Jungle crashes, shipboard sabotage, and break-ins at Blackwood’s facilities mean Marty and Grace are often split up, forced to make their own calls. Marty’s willingness to leap first can save them or put them in deeper danger; Grace’s habit of thinking three steps ahead can be the difference between a clever plan and a missed chance. Watching them argue, adapt, and eventually act as a team is a big part of the appeal.

The series also keeps circling around adults who are not quite what they seem. Wolfe is fierce and protective but distracted by the next expedition. Noah Blackwood presents himself as a polished conservationist while running a ruthless, money-driven empire. Even allies like pilots, security staff, and scientists may have split loyalties. Marty and Grace learn to read people, not just animals and maps, and to rely on each other when the grown-ups fall short.

Readers who love creature lore still get what they came for—cryptids in the jungle, giant squid in the deep ocean, rumors of legendary bloodsuckers. But the heartbeat of the Marty and Grace arc is watching two kids grow from passengers to partners who help steer their own story. If you’re coming to the series through these characters, start at Cryptid Hunters and follow them straight through Mutation to see how far they come.