The Bitter Sixteen Trilogy: Book 2 by Stefan Mohamed
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Stanly is frustrated. Having set himself up as London's protector, he's finding that the everyday practicalities of superheroism are challenging at best, and downright tedious at worst. So it's almost a relief when an attempt is made on his life and Stanly finds himself rushing headlong into a twisted adventure, with enemies new and old coming out of the woodwork. However, even with his friends and his ever-increasing power behind him, he may have bitten off more than he can chew this time. The monsters are coming ... and nothing will ever be the same!