It’s tough working nights with the NYPD. The crime rate is high, the hours are terrible, and forget about a personal life. So, when Officer O’Reilly and her K-9 Rolf switch over to the day shift, things look up. She’s even able to find time for a new boyfriend. But when the theft of a priceless painting from the Queens Museum leaves a fellow police officer dead, Erin and her four-legged partner find themselves dealing with dangerous criminals, sleazy art dealers, and obstructive detectives in a race to capture the killers...and just maybe bring closure to a 75-year-old crime.

FBI Special Agent Maya Gray, 39, has seen it all. She’s one of BAU’s rising stars and the go-to agent for hard-to-crack serial cases. When she receives a handwritten postcard promising to release 12 kidnapped women if she will solve 12 cold cases, she assumes it’s a hoax.

DI Thomas Ridpath was on the up in the Manchester CID: a promising detective who captured a notorious serial killer. But 10 years later, he’s recovering from a serious illness and on the brink of being forced out of the police. Then people start dying, in an uncanny echo of his first case.

The beautiful young woman is perfectly still, curled up in the trunk of the car, her long dark hair hiding her face. Her cotton blouse has ridden up a little, revealing two small dots an inch apart on her back. Just like the others. Guilt has kept FBI Agent Tori Hunter away from her home in Manchester Bay, Minnesota for 20 years, ever since her twin sister disappeared on the Fourth of July, when the girls should have been together. But when she receives an anonymous newspaper clipping about another missing girl, Genevieve, Tori is dragged back to the past.

When an unexpected visitor bursts into Hercule Poirot's home and collapses onto the floor, the atmosphere becomes charged with intrigue. The only clue to his purpose is the repetition of Poirot's name and address, accompanied by the insistent scribbling of the number four. Gradually, the man regains consciousness and begins to divulge information about an insidious international crime syndicate known as "the Big Four".