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Books

Three books on what actually matters: the unit economics of survival, the physics of momentum, and what it really means to back a founder with your own money.

Cover of Angel in Hell
English Featured

Angel in Hell

How to invest in a startup without losing everything

The first book written from an angel investor's perspective. Practical knowledge about investing in startups — from evaluating founders through due diligence to exit.

Cover of Anioł w Piekle
Polish Featured

Anioł w Piekle

Jak zainwestować w startup i nie stracić wszystkiego

Pierwsza polska książka napisana z perspektywy anioła biznesu. Ponad 200 stron praktycznej wiedzy o inwestowaniu w startupy.

Cover of The Two Numbers
English Featured

The Two Numbers

The only metrics that determine whether your startup lives or dies

LTV and CAC. That's it. Everything else is noise. This book shows founders how to calculate, interpret, and act on the two numbers that every investor will ask about — before they ask.

Cover of Power of Momentum
English

Power of Momentum

How from 0 I co-founded companies worth more than 5 billion euros

Momentum is the one thing you can't buy or copy. You can build it — or lose it. This book shows how, through the story of building 10+ companies from scratch.