About the authors Holtes & Sietsma is the pseudonym of the Dutch authors Bert Holtes and Wop Sietsma. Both authors were born in 1957, Bert in Alkmaar and Wop in Sneek. Bert spent his working life as a pastry chef, marine, police officer, entrepreneur and manager in various industries, while Wop worked as a secretary and as an independent IT worker in the computer world before they both began enjoying their free time. They are the joint authors of the fictional thriller series BACK-UP.
Breaking NewsMany have been looking forward to it for a long time, and at last the time has come, as the press release from the Dutch authoring duo Holtes & Sietsma lands on the door mat of INN's book editors: the long-awaited news that their third and final book has finally...
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