Adventurer Marah Chase might just be ready to settle down--but she can't resist one last epic, globe-trotting quest to rescue a friend and discover a legendary locale. Marah Chase has everything she wanted. Her academic career is back on track, she's moved into a Manhattan apartment, and a dream job is waiting at the American Museum of Natural History. So why can't she seem to stop slipping into her old ways, traveling the world in search of lost relics and buried treasure? Back out in the field, Chase finds the lost Ark of the Covenant, a discovery that could trigger a holy war, as religions and nations argue over ownership of the sacred item. The Ark also brings Chase into conflict with another legendary relic runner, August Nash, a clash the entire underground smuggling community has been waiting for, and not one that will end anytime soon. Upon returning home, Chase is hired by US soda billionaire Lauren Stanford to find the Fountain of Youth. At first, Chase dismisses this idea. But then Stanford tells her that an old friend found some information on the Fountain's location and is now missing.

Chase agrees to take the job--but only to find her friend--and enlists allies along the way on a trail from New York to London, and then on to Glasgow. Behind the myth, they find, lies a much older secret, and now they're in a race to find the Fountain ahead of Nash and his nefarious cohorts. Whoever gets there first will have control over the future of humanity. Marah Chase and the Fountain of Youth is a tense, exciting, and epic adventure novel, spanning three continents and broadening the world of the Marah Chase series, placing Chase in the unique position to confront questions of identity, faith, imperialism, and appropriation.