Sebastián Aragón, 35, LACMA's brilliant, solitary Medieval Curator suffers from an undiagnosed blood condition and fragmented feudal fantasies. Chess, history, and technology became his anchors after the 2008 Spanair Madrid crash that killed his chess master parents Sylvia and Robert. Everything changes when Museum Director Anderson Flores sends him to Spain to acquire the Black Castle, a massive 11th Century fortress.

Sebastián’s inspection unearths a crypt and tomb-of his own 15th-century corpse. A hand clasping a rapier wears a matching crest ring; a gold cylinder protects a castle deed signed by King Fernando in 1486. A journal in his handwriting details the unspeakable. Scarcely breathing, he pockets the ring and finger. DNA match verified by his L.A. plasma supplier, Sebastián's world transforms. His spectral 15th-century wife Ana, a Sephardi Alchemist arrested in 1487 by the Inquisition, and his former squire Pedro Rodriguez (now a time-traveling Uber driver) confirm his true identity. Sebastián needs proof. A Cordoban alchemist crafts blood serum from the fingerbone's marrow; reviving memory, muscles, powers and libido. Time traveling operative, Paz Ortal provides an antique Star of David token essential for temporal jumps.

His personas merge, strategize. Don Sebastián, 7th Lord of Aragón, time traveler, bold vampire warrior with unfinished 15th Century business and Sebastián Aragón, precise, tech-savvy, modern-day curator rescue Ana from the past, claim the Black Castle, settle scores: Sebastián’s half-brother Inquisitor Diego-Ana’s killer-has it coming, as does Anderson Flores; whose scam to flip Sebastián’s ancestral home is demolished when James the rude broker sent to steal the Black Castle finds the tomb, and a thirsty Lord Aragón. In turn, Sebastián secures Montearagon for LACMA; the haunted Templar fortress draws sold-out crowds. Chess master strategies raise Sebastián to Museum Director, but his soul is with Ana in 1487.