A young man spends a whole day lying naked on the floor of his apartment, conversing casually with his roommates, pondering the past, considering the lives being lived around him. In the odd and funny, sad yet somehow hopeful conceit of Sean Beaudoin’s story “Exposure,” are all the elements that make his debut collection, Welcome Thieves, a standout. In twelve virtuosic stories, Beaudoin trains his absurdist’s eye on the ridiculous perplexities of adult life. From muddling through after the apocalypse (“Base Omega Has Twelve Dictates”) to the knowing smirk of “You Too Can Graduate with a Degree in Contextual Semiotics,” Beaudoin’s stories are edgy and profane, bittersweet and angry, bemused and sardonic. Yet they’re always tinged with heart.