There's no secret to losing weight, all you have to do is create a small daily energy deficit of ~300-500/day* and you don't need to buy any e-books to figure out how to do that as you can find plenty of free stuff online.
For example you could go here
to calculate your estimated daily calorie requirements then deduct 300-500kcals from that figure as you're trying to lose weight and adjust the macros to 60%, 20%, 20% carbs, fats and protein respectively. Then go here
to work out a simple meal plan. Alternatively you could do it all here
instead, either way they're all free and as good as or better than a lot of the commmercially available software.
*As long as that is not >15% of daily energy requirements.