A diamond and emerald engagement ring sparkles on Liz Bertelli's finger that snowy Christmas day in New York State's pine-scented Mountains. Liz has accepted a marriage proposal from Carlos Martin, a presidential aide who has flown aboard Air Force One and dined in the White House. The couple is gathered with family and friends for a Hispanic feast with roasted pork and other delights spread on the table. Liz's best friend, Rosa Ramirez is there with Carlos' Army hero brother, Jack. The chemistry between them sparkles in their loving glances. Hints of trouble come with a disturbing phone call from Liz's ex-husband, Steve. He seems determined to ruin Liz and Carlos' joy and sabotage their upcoming wedding in St. Augustine, Florida. Equally determined to exchange their vows, the couple arrive on the scene. Jack and Rosa join them. But as an approaching hurricane rustling palm trees and crashing waves to the shore, signals danger, Steve's threatening words and actions forecast trouble. A rash decision Liz makes against her better judgment, adds to the tempest. Can Steve get past Jack and his motorcycle buddies to stop Liz and Carlos' wedding? And how does a tiny acorn lead to a big surprise? It all unfolds in When Love Becomes Obsession, second in the Castle in the Sun, romantic-suspense series.