Cannot find ebook downloaded from Play Store

For the first time I have downloaded (or have I?) and paid for an ebook from the Google Play Store. I cannot find it anywhere on my Samsung Galaxy Tab A (wih Lollipop). I have used Search in My Files and other file managers with zero results. I would have though the Play Store would have easy access to help with such issues but so far have not found it.

Advice would be welcome.

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