Michael Dahl, the author of more than a dozen non?ction books, has also published poetry and plays. The Viking Claw is Dahl's fourth Finnegan Zwake mystery. The earlier titles in the series are The Horizontal Man, The Worm Tunnel, and The Ruby Raven. Dahl is also the author of Scooter Spies, a series of mysteries for younger readers, whose titles include The Wheels That Vanished and The Ghost That Barked. A theater director, actor, and comedian in Minneapolis, Dahl has a wide variety of unusual creatures in his household: Venus's-?ytraps, ?ddler crabs, African dwarf frogs, an elementary school teacher, and an Australian red-heeler named Gus. He can be e-mailed at ?firstname.lastname@example.org.