Publishers Weekly Review of Reprobate:
Fast-moving and intricately plotted, this manuscript of Dutch intrigue follows assassin Katla, who's renowned for her ability to cover up a job. When the U.S. DEA's base in the Netherlands catches wind of a heroin ring within the U.S. military, they set up an undercover operation. When the heads of the drug ring discover the plot, they arrange for Katla to assassinate the undercover agents, but the assassination doesn't go as planned. As Katla recovers from injuries sustained in the botched job, DEA agent Deborah Stern and her colleagues investigate. Violence, drugs, and sex abound in this intense story, and the plot is less farcical than a lot of the thrillers clogging the shelves. 
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The Amsterdam Assassin Series by Martyn V. Halm revolves around freelance assassin and corporate troubleshooter Katla Sieltjes. Under the name Loki Enterprises, Katla specialises in disguising homicide and providing her own brand of permanent solutions for both individuals and corporations, often using unconventional methods.

All e-books in the Amsterdam Assassin Series are stand-alone novels and short stories.

NOVELS

Reprobate

Assassin Katla breaks her own rules when confronted with an unusual witness...

Blessed with an almost non-existent conscience, freelance assassin and corporate troubleshooter Katla Sieltjes, expert in disguising homicide, regards murder for profit as an intricate and rewarding occupation. Her solitary existence seems more than satisfactory until a blind musician wanders in on her crime scene.
Katla only kills for profit or to protect her anonymity, and Bram Merleyn seems harmless and unable to identify her. By sparing his life, she breaks one of her most important rules--never leave a living witness. A decision Katla might not survive to regret...

Reprobate is the first novel in the Amsterdam Assassin Series.

Peccadillo

Assassin Katla's legitimate business becomes the target of a hostile takeover...

Still recuperating from injuries sustained in Reprobate, freelance assassin and corporate troubleshooter Katla Sieltjes, expert in disguising homicide, finds herself at war with the Kau Hong, a gang of ruthless criminals who will stop at nothing to get their hands on Sphinx Shipping.
The potentially lethal situation quickly becomes untenable, when victims fall on both sides, and a Hong Kong sniper arrives to team up with a mute enforcer from the competitive 14K Triad.
Amsterdam might prove too small for Katla to play hide and seek, when her enemies match her skills in search and destroy...

Peccadillo is the second novel in the Amsterdam Assassin Series.

Rogue

Assassin Katla kills the wrong target and draws attention from combined intelligence communities...

Freelance assassin and corporate troubleshooter Katla Sieltjes runs her business of disguising homicide below the radar of law enforcement, but when her latest target is a judas goat intended to draw her out into the open, the hunter becomes the hunted.
Fooling local law enforcement can be challenging, but hiding from intelligence communities aiming to enlist Katla for their dirty work might prove impossible.
With Homeland Security, DEA, and the German BKA joining forces with Dutch Intelligence in an effort to track down Loki Enterprises, not only Katla's future is threatened, but also the lives of her lover and his friends.

Rogue is the third novel in the Amsterdam Assassin Series.

Ghosting

Assassin Katla's sabbatical year turns out to be her biggest challenge yet...

After her narrow escape from the intense investigations by combined intelligence forces, freelance assassin and corporate troubleshooter Katla Sieltjes takes a sabbatical to thwart the relentless scrutiny by the authorities.
But there's no rest for the wicked.
An unexpected pregnancy, a brother in peril, a secretive consultant, and an assiduous infiltrator conspire to force Katla to renege on her vows and once again do what she does best: solving problems in her own unparalleled way.

Ghosting is the fourth novel in the Amsterdam Assassin Series.

KillFiles

The Katla KillFile short stories chronologically precede the novels in the Amsterdam Assassin Series.

Each KillFile features freelance assassin and corporate troubleshooter Katla Sieltjes, expert in disguising homicide, executing one of her contracts. While not mandatory reading, each KillFile provides insight both in Katla's work methods and skill, and additional background information in her character and personal history. The KillFiles can be read out of order, as the contracts are random samples from Katla's past.

Locked Room

Assassin Katla reinvents a forensic landmark while creating a Locked Room mystery...

The Locked Room KillFile (7,800 words) follows freelance assassin Katla Sieltjes executing a contract on a physician responsible for the death of her client's wife. Using an updated version of a lethal puzzle that astounded forensic scientists at the end of the twentieth century, Katla recreates a diabolical killing method that became a landmark in the forensic sciences. Thwarting forensic scientists is not her only hurdle in fulfilling her contract, as her target has to be killed in his home, an opulent penthouse in a fortress-like apartment building...

Microchip Murder

Assassin Katla has to kill an industrial spy and retrieve the stolen item...

The Microchip Murder KillFile (8,500 words) follows freelance assassin Katla Sieltjes executing a contract on an industrial spy, who is in the process of selling a stolen microchip with valuable software to the competition. Katla's client wants the stolen microchip and research materials returned to him, but her target is wary and the unscrupulous buyers are prepared to kill for the stolen software.

Fundamental Error

Assassin Katla is hired by a client whose brother is planning a terrorist attack...

The Fundamental Error KillFile (9,800 words) follows freelance assassin Katla Sieltjes on her most dangerous assignment yet. When Peter Brandt watches his brother Roel convert to Islam and turn into a domestic terrorist, Katla needs to enter into the mind of a fanatic suicide bomber in order to thwart a mass-murder attack in the shopping mecca of Amsterdam.

Aconite Attack

Assassin Katla finds a devious way to get a target to poison himself...

The Aconite Attack KillFile (10,700 words) follows Katla Sieltjes on her first foray as a freelance assassin and corporate troubleshooter, when she gets herself hired by the CEO of a modelling agency to permanently remove his playboy partner draining the firm's resources on his downward spiral into self-destruction. Katla finds a way to administer poison to the target, but he has to be isolated for her plan to succeed. Every plan has a fluke factor though, and Katla soon finds herself in mortal danger, when the target reveals his darker side...

ALL BOOKS AND STORIES CAN BE READ AS STAND-ALONE