In the dead of night, James Kilburn struggles ashore near Dublin with an enormous cocaine haul; later, Ashley Naughton leaves a city nightclub owned by lowlife Vinnie York. Both vanish. Notorious Dublin criminal Patric York arrives from Holland to investigate his missing haul. The heat is on, particularly for his son Vinnie and for Patrick's longtime cohort Edward Naughton, father of Ashley. Rookie detectives Sarah Kenny and John Quigley are called in by the missing girl's mother. As fears grow for Ashley, they must piece together a dangerous puzzle—and try to dodge the bullets. Would Edward Naughton sacrifice his own daughter to keep ahead of a multimillion-euro industry? And why, just when they're getting somewhere, does their client call off the search?

The brutally murdered body of a young girl is discovered in the Wicklow mountains. Her identity is unknown. One month later David Reid, a successful designer, is found dead in a Dublin canal. Close to his body is a broken silver key ring with the words Meridian Club on it. The police are eager to chalk it up to death by misadventure, but his brother refuses to accept their findings, and enlists the help of rookie detectives John Quigley and Sarah Kenny of Quick Investigations. As the investigation progresses, Sarah and John begin to learn that there was more to David Reid than his brother knew. And in no time at all, the body count is rising and everyone is lying to protect their own. What happened to David Reid that night? Is he connected to the young dead girl? What is the Meridian Club? As John and Sarah struggle to find the answers to those questions, little do they realize their investigation is starting to ruffle the feathers of one very dangerous man.

1980 – Missing presumed dead: that’s what everybody thought when Katie Jones, a beautiful blonde toddler, vanished while playing on the water’s edge one hot summer’s day. 2006 – A young woman arrives on a Dublin doorstep wielding a gun. She shoots the man who opens the door, then turns the gun on herself. The woman is Katie Jones, and soon a lot of people – especially her family – are looking for answers. Where was she? Who took her all those years ago? And why did she shoot Walter Hogan, a retired GP, straight between the eyes before shooting herself? John Quigley and Sarah Kenny of QuicK investigations are soon involved in their most difficult case so far. The pressure is building and, as they delve deeper into the murky world surrounding Katie Jones, they are unaware that somebody from Sarah’s past is watching and waiting to strike when they least expect it. “M.P.D.” is a compulsive thriller that deals with loss, betrayal and revenge. John and Sarah are about to discover the cost of all three.

A missing boyfriend ... a heavily pregnant girlfriend ... just another ordinary case for QuicK Investigations. But the trail they follow suggests something far from ordinary. Who is Orie Kavlar and why has he gone to ground? What is the connection to the body of a dead girl found on waste ground in Sandyford? And what is his relationship to Darren Wallace, ex-gangland criminal? With their personal relationship at a new all-time low, Sarah and John are straining under the weight of their own like the murder of Sarah's ex-boyfriend Vic. Vic was a dangerous psychotic, but murder is murder. So why won't she accept John's help? In no time John and Sarah's investigations alert others to their search and as they dig deeper into Orie Kavlar's life, one man decides he has too much to lose to allow them to continue. Sarah and John are about to be caught up in an undertow of violence that will suck them into their most perilous case yet.

Death and violence are all Pavel Sunic has ever known. Only one person matters to him, his sister Ana. When she pays the ultimate price to secure his release from a Bosnian prison, Pavel Sunic vows to avenge her death. The bloody path he creates leads to Dublin. Quick Investigations is suffering. With Sarah Kenny still missing, John Quigley struggles to keep the business afloat. When Rose Butler approaches him to investigate the death of her daughter Alison, John takes the case even though the evidence points to suicide. Yet why did the promising doctor and mother of two choose to die alone in a shabby hotel room? What was her relationship with Ivan Colbert, a disgraced surgeon? And just how dangerous is the dead woman’s husband? Torn between his case and his personal life, John is stretched beyond capacity. And the arrival of Pavel Sunic threatens to bring the whole pack of cards crashing down. Blood Money: first do no harm, second, run for cover.