Rachel Hartigan's new book *Lost* reexamines three dominant theories about Earhart's 1937 vanishing. The castaway hypothesis—bolstered by 2017 Nikumaroro Island artifacts like a 1930s zipper pull and fire pit—posits Earhart and Noonan survived the crash and died as island castaways. However, Hartigan argues these 1930s-era items only confirm *someone* died there, not specifically Earhart. Cadaver dogs detected potential remains, but no skeletal evidence has been found. The author favors the simplest explanation: navigational error leading to fuel exhaustion and oceanic crash.

Hartigan traces the evolution of theories, including a discredited 1970s claim that Earhart became Irene Craigmile Bolam under a new identity. She contextualizes modern tech-driven searches, such as 2003-2006 Nauticos deep-sea sonar surveys mapping 1,200 square miles near Howland Island. A 2024 expedition using advanced sonar again failed to locate the Electra 727, despite analyzing radio signal drift patterns from Earhart's fragmented transmissions.

The book highlights unresolved tensions between circumstantial island evidence and the lack of conclusive proof. While Nikumaroro's artifacts intrigue historians, Hartigan stresses that absence of human remains undermines the castaway narrative. She contrasts this with the 1937 radio silence after reportedly hearing Howland Island's direction finder signal—a clue aligning with the crash theory. Aviation archaeologists remain divided over which technology might finally resolve the mystery.

Earhart's case persists as a cultural touchstone, blending historical intrigue with technological limitations. The author emphasizes that deep-sea exploration tools—like 2024's Howland Island sonar sweep—offer renewed hope but face challenges matching 1930s wreckage to modern scans. Without physical remains or definitive wreckage, the Amelia Earhart disappearance may endure as one of aviation's greatest enigmas.