Buy-Links

Books 1-3
Michael's story
Hamelin's Child Paying the Piper Calling the Tune
Books 4-6
Lenny's story
Calling the Tune Ratline Ratline

Amazon Kindle
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Buy books from Amazon US
Other Amazon sites also available
Kobo
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Many other Kobo sites also available
iBooks
Buy books from Apple UK via iTunes
Buy books from Apple US via iTunes
All other Apple/iTunes sites also available
Nook

Buy books from Barnes & Noble
And other Nook sites

Also available via Page Foundry/Inktera, German Tolino distributors: Thalia, Hugendubel, Weltbild and many other ebook stores

All ebook formats (inc PDF and text)
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Print books (paperback)
Buy paperback from Amazon UK (And on other Amazon sites)
Buy paperback from CreateSpace US
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Buy paperback from Book Depository (Free postage worldwide)