✅ How to correctly write conditions with expressions?

public static class BookPolicy
    {
        public static void AllowRead(Book book)
        {
            var isHorrorBook = Specifications.IsHorrorBook().Compile();
            var isPonyBook = Specifications.IsPonyBook().Compile();

            if (isHorrorBook(book) || isPonyBook(book))
                throw new Exception("Horror or pony books don't allow here");
        }
    }

    public static class Specifications
    {
        public static Expression<Func<Book, bool>> IsHorrorBook() =>
            book => book.Title.Contains("Frankenstein");
        
        public static Expression<Func<Book, bool>> IsPonyBook() =>
            book => book.Title.Contains("Pony");
    }

public static class BookPolicy
    {
        public static void AllowRead(Book book)
        {
            var isHorrorBook = Specifications.IsHorrorBook().Compile();
            var isPonyBook = Specifications.IsPonyBook().Compile();

            if (isHorrorBook(book) || isPonyBook(book))
                throw new Exception("Horror or pony books don't allow here");
        }
    }

    public static class Specifications
    {
        public static Expression<Func<Book, bool>> IsHorrorBook() =>
            book => book.Title.Contains("Frankenstein");
        
        public static Expression<Func<Book, bool>> IsPonyBook() =>
            book => book.Title.Contains("Pony");
    }