James Patterson 
Second Honeymoon 
Two FBI agents hunt a serial killer targeting newly-weds

It was a holiday to die for.FBI agent John O Hara receives a call from a man desperate for his help. His son and daughter-in-law have been found murdered on their honeymoon in the Caribbean.The grieving father wants justice, and will pay O Hara handsomely to hunt down the killer.Federal agents aren t allowed to moonlight, but O Hara is on suspension and battling some serious demons. He takes on the case. But as O Hara delves deeper and the body count rises, a past he thought was dead and buried comes back to haunt him…