A forgotten signal. A collapsing star. A final test of courage.When a strange harmonic pattern emerges from a solar probe, Richard and the team are sent to investigate-and what they find changes everything.Buried deep within the Sun lies an ancient archive left by a vanished stellar race-an alien system that evaluates stars for long-term stability. But the archive is breaking down... and if it fails, it could trigger a deadly solar collapse aimed straight at Mercury and Venus.Joined by allies both trusted and unexpected-including the elusive Leika Rune-Richard, Ashton, and Dooley must descend into the Sun's upper corona to stabilize the system. But the final sequence requires more than knowledge... it demands sacrifice. Book 10 of the Space Cadet Legacy seriesConclusion of the Solar Vault SagaFor fans of clean sci-fi, teamwork, space tech, and courageous teens facing the unknown