The Disappearance of Christina

Lily was behind everything because she was in love with Joe and wanted him for herself. She killed Mike to cover up their affair and the financial fraud they committed together. By making Joe believe Christina was still alive and framing him for murder, Lily manipulated him into trusting her and thought they could run away together. The red dress, the phone calls, and the bracelet were all part of her elaborate scheme to control Joe and eliminate anyone in her way.

Lily's earlier comment that she believes Christina is still alive plants the seed for her manipulation.

The movie never definitively reveals Christina's fate. The final scene shows a woman who appears to be Christina walking to the spot where Joe was watching the sunset, implying she may still be alive. However, Detective Davis tells Joe he will never know what happened to her, leaving the mystery unresolved. Lily claimed she didn't kill Christina when asked, but her actual fate remains unknown.

Madeleine's incoherent ramble about Christina 'flying away' hints at something unexplained.

Yes. At gunpoint, Mike confesses to Joe that he did have an affair with Christina, though he claims it was a long time ago, before she disappeared. He insists he hasn't seen her since she vanished and has been seeing a psychiatrist during lunch breaks. However, the evidence suggests otherwise, Joe and Lily found a condo purchased by Mike and a woman resembling Christina in February.

Lily reveals to Joe that Mike is having an affair, though she doesn't specify with whom.

Lily killed Mike to cover up their affair and the financial fraud they committed together. When Joe and Lily discovered the condo and realized Mike and Christina were involved, Lily panicked. She needed to silence Mike before he could reveal their partnership in both the embezzlement and whatever happened to Christina. Lily admits to Joe that she stole the construction project money and killed Mike to prevent him from exposing the truth.

Mike's confession that he wishes Lily had been the one who disappeared shows the deteriorating state of their marriage.

The red dress was part of Lily's scheme to frame Joe for murder. She planted it in his dryer to make it appear Christina had been in the house. Detective Davis later reveals the dress was brand new and had never been worn, confirming it was placed there intentionally to incriminate Joe. Joe found it strangely reassuring because if Christina was framing him, at least she would be alive.

Joe finds Christina's date book missing earlier, showing someone has access to his home.

Joe was arrested because the maid found Christina's red dress in his dryer and turned it over to police. The dress, combined with Joe's strange behavior and the discovery that Christina had filed for divorce, made him the prime suspect. He was quickly released due to lack of hard evidence, but the arrest intensified the police's suspicion that he was responsible for Christina's disappearance.

Joe hides the dress when he finds it, which appears suspicious when the maid discovers it's missing.

The secret crawl space in the boat's cabin was a hidden compartment where Christina could have conceivably hidden during the sailing trip. Joe and Lily discover this space while investigating, suggesting Christina may have faked her disappearance by hiding in the compartment and later leaving the boat somehow. This supports the theory that Christina orchestrated her own disappearance rather than drowning or being killed.

Christina disappears from the deck alone while everyone else is aboard, with no explanation.

The voice calling Joe to say 'I'm sorry I didn't say goodbye' was not actually Christina, it was Lily gaslighting him. Later, Joe discovers an old answering machine message from Christina to Lily with the same phrase, proving Lily recorded it and used it to manipulate Joe into believing Christina was still alive and reaching out to him.

The call happens right after Joe receives a mysterious hang-up, establishing someone is watching him.

Detective Davis suspected Joe because several factors pointed to him: Christina had filed for divorce two days before disappearing, Joe was the last person known to be with her, and the planted evidence (red dress) suggested she had been in his house. Additionally, Joe's erratic behavior and insistence that Christina was alive made him seem unstable. Davis was convinced Joe had murdered his wife until the truth about Lily emerged.

The divorce papers surfacing immediately after Christina's disappearance creates immediate suspicion around Joe.

The financial discrepancies involved large sums of money missing from a major construction project that Joe and Mike were working on together. Joe discovers that Christina had signed off on one of the accounts, and later learns that Lily was the one who stole the money. The missing funds were part of the scheme between Mike, Lily, and possibly Christina to embezzle money and run away together.

Mike suggests Christina committed suicide or fell overboard, deflecting attention from the financial motives.

Christina filed for divorce two days before her disappearance, but the exact reasons are never fully explained. Joe insists their marriage was fine, suggesting he was unaware of any problems. The evidence suggests she may have been involved with Mike and planning to leave, possibly as part of a larger scheme involving the financial fraud and the condo purchase. Her filing for divorce provided the apparent motive for Joe to harm her.

Joe's dream of Christina trying to drown him hints at underlying marital problems.

Joe and Lily visit Christina's sister Madeleine at a psychiatric hospital, where she is incoherent and claims Christina visited and 'flew away.' Joe notices Christina's bracelet on Madeleine's wrist and tries to take it, causing Madeleine to scream. Detective Davis later tells Joe there was no bracelet, suggesting either Madeleine doesn't have it or the police are covering something up. This incident adds to the mystery of whether Madeleine knows more about Christina's fate.

The bracelet appears briefly as potential evidence of Christina being alive.